People v. Caballes ( 2006 )


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  •                       Docket No. 91547.
    IN THE
    SUPREME COURT
    OF
    THE STATE OF ILLINOIS
    THE PEOPLE OF THE STATE OF ILLINOIS, Appellee, v. ROY
    I.              CABALLES, Appellant.
    Opinion filed May 18, 2006.
    JUSTICE GARMAN delivered the judgment of the court,
    with opinion.
    Chief Justice Thomas and Justices Fitzgerald and Karmeier
    concurred in the judgment and opinion.
    Justice Freeman dissented, with opinion, joined by Justices
    McMorrow and Kilbride.
    OPINION
    On January 24, 2005, the Supreme Court of the United
    States vacated this court=s judgment in People v. Caballes, 
    207 Ill. 2d 504
    (2003) (Caballes I), and remanded the cause for
    Afurther proceedings not inconsistent with this opinion.@ Illinois
    v. Caballes, 
    543 U.S. 405
    , 410, 
    160 L. Ed. 2d 842
    , 848, 125 S.
    Ct. 834, 838 (2005). Both the Supreme Court and this court in
    its now-vacated judgment considered only defendant=s fourth
    amendment claim. However, in his original brief to this court,
    defendant also relied on article I, section 6, of the Illinois
    Constitution of 1970. Ill. Const. 1970, art. I, '6. Therefore, we
    must now consider whether, even though the canine sniff of
    defendant=s car during a routine traffic stop did not implicate
    the fourth amendment, it nevertheless violated the guarantees
    of the state constitution.
    We have allowed defendant=s motion to permit additional
    briefing of the state constitutional issues. In addition, we have
    permitted the Illinois State Bar Association (ISBA), with the
    Office of the Cook County Public Defender, and the American
    Civil Liberties Union of Illinois (ACLU), with a number of other
    organizations, to file briefs amici curiae on behalf of the
    defendant. 155 Ill. 2d R. 345.
    BACKGROUND
    The facts surrounding defendant=s arrest are described in
    detail in our earlier opinion. Caballes 
    I, 207 Ill. 2d at 506-08
    . In
    brief, defendant was stopped on an interstate highway by an
    Illinois state trooper for the offense of speeding. The trooper
    radioed the police dispatcher to report that he was making a
    stop. Before he began to write the ticket, he again radioed the
    police dispatcher to determine whether defendant=s license
    was valid and to check for outstanding warrants.
    When the trooper first radioed the police dispatcher to
    report the stop, a second trooper heard the transmission and
    immediately responded to the scene. The second trooper, a
    member of the Illinois State Police Drug Interdiction Team, was
    accompanied by a dog trained to detect narcotics. He and the
    dog arrived and walked around defendant=s car while the first
    trooper was in the process of writing a warning ticket. The dog
    -2-
    alerted at the trunk. A search of the trunk revealed marijuana
    and defendant was placed under arrest. Approximately 10
    minutes elapsed between the stop and the arrest.
    The trial court denied defendant=s motion to suppress
    evidence and quash arrest. After a bench trial, defendant was
    convicted of cannabis trafficking (720 ILCS 550/5.1(a) (West
    1998)), sentenced to a term of 12 years in prison, and ordered
    to pay a street-value fine of $256,136. The appellate court
    affirmed, holding that the police are not required to have
    reasonable suspicion before conducting a canine sniff and that
    although the license and warrant check improperly extended
    the duration of the stop in this case, the resulting delay was de
    minimis. People v. Caballes, No. 3B99B0932 (2001)
    (unpublished under Supreme Court Rule 23).
    This court reversed, with three justices dissenting. Relying
    on People v. Cox, 
    202 Ill. 2d 462
    , 470-71 (2002), this court
    held that when a canine sniff is Aperformed without > Aspecific
    and articulable facts@ = to support its use,@ it unjustifiably
    enlarges Athe scope of a routine traffic stop into a drug
    investigation.@ Caballes 
    I, 207 Ill. 2d at 510
    . Without addressing
    the appellate court=s conclusion that duration of the stop was
    not unjustifiably prolonged, this court concluded that the
    evidence should have been suppressed. The dissenting
    justices, relying on City of Indianapolis v. Edmond, 
    531 U.S. 32
    , 
    148 L. Ed. 2d 333
    , 
    121 S. Ct. 447
    (2000), would have
    affirmed on the basis that a canine sniff is not a search.
    Caballes 
    I, 207 Ill. 2d at 512
    (Thomas, J., dissenting, joined by
    Fitzgerald and Garman, JJ.).
    Although this court did not expressly state that it was
    conducting its analysis solely under the fourth amendment to
    the United States Constitution, it did state that it was applying
    the principles of Terry v. Ohio, 
    392 U.S. 1
    , 
    20 L. Ed. 2d 889
    , 
    88 S. Ct. 1868
    (1968), as it had previously done in other cases
    involving routine traffic stops. Caballes 
    I, 207 Ill. 2d at 508
    . The
    majority implicitly and the dissent explicitly (Caballes I, 
    207 Ill. 2d
    at 514 (Thomas, J., dissenting, joined by Fitzgerald and
    Garman, JJ.)), relied on fourth amendment jurisprudence. In
    Caballes I, this court gave no consideration to defendant=s
    argument that the evidence against him should have been
    -3-
    suppressed under the provisions of the Illinois Constitution of
    1970 (Ill. Const. 1970, art. I, '6).
    The Supreme Court of the United States granted the State=s
    petition for a writ of certiorari. Proceeding from the premise that
    the Aduration of the stop in this case was entirely justified by
    the traffic offense and the ordinary inquiries incident to such a
    stop@ 
    (Caballes, 543 U.S. at 408
    , 160 L. Ed. 2d at 
    846-47, 125 S. Ct. at 837
    ), the Court framed the issue as whether a dog
    sniff, otherwise conducted in a reasonable manner, changes
    the character of a traffic stop that is lawful at its inception.
    
    Caballes, 543 U.S. at 408
    , 160 L. Ed. 2d at 
    847, 125 S. Ct. at 837
    .
    The Court answered this question in the negative. Official
    conduct does not constitute a search for fourth amendment
    purposes unless it compromises a legitimate interest in privacy.
    Because an individual=s interest in possessing contraband
    cannot be deemed legitimate, official conduct that merely
    reveals the possession of contraband does not compromise a
    legitimate privacy interest. 
    Caballes, 543 U.S. at 408
    , 160 L.
    Ed. 2d at 
    847, 125 S. Ct. at 837
    . A canine sniff by a dog trained
    to detect the presence of narcotics discloses only the presence
    or absence of contraband and, therefore, Adoes not implicate
    legitimate privacy interests.@ 
    Caballes, 543 U.S. at 409
    , 160 L.
    Ed. 2d at 
    847, 125 S. Ct. at 838
    . The Court noted that this
    analysis is consistent with its earlier decision that the use of
    thermal-imaging equipment to detect the growing of marijuana
    plants inside a home is an unlawful search. Unlike the canine
    sniff, which will not reveal noncontraband items of a private
    nature, thermal imaging may reveal Aintimate details@ within a
    home, such as conduct in the bedroom or bathroom. 
    Caballes, 543 U.S. at 409
    -10, 160 L. Ed. 2d at 
    848, 125 S. Ct. at 838
    ,
    citing Kyllo v. United States, 
    533 U.S. 27
    , 
    150 L. Ed. 2d 94
    ,
    
    121 S. Ct. 2038
    (2001).
    ISSUES
    Defendant makes three separate claims on remand. First,
    he argues that this court should not continue to interpret and
    apply the search and seizure provision of article I, section 6, of
    -4-
    the Illinois Constitution of 1970 in lockstep with the United
    States Supreme Court=s interpretation and application of the
    search and seizure clause of the fourth amendment to the
    United States Constitution. Second, defendant asserts that
    unless the police have probable cause or reasonable
    suspicion, the use of a canine sniff during a routine traffic stop
    violates the privacy clause of article I, section 6, of the Illinois
    Constitution of 1970. Third, defendant claims that the evidence
    obtained as a result of the dog sniff should be suppressed
    because the technique is not sufficiently reliable.
    Standard of Review
    Defendant proposes de novo review on the basis that this is
    the proper standard of review of a trial court=s Aultimate finding
    of probable cause or reasonable suspicion,@ citing People v.
    Sorenson, 
    196 Ill. 2d 425
    , 431 (2001).
    As for the first two issues raised by defendant, de novo
    review is appropriate, but not for the reason stated by
    defendant. We are asked to consider whether to abandon or
    reaffirm the lockstep doctrine and whether the right to privacy
    guaranteed by the state constitution is implicated by a dog sniff
    of a car during a routine traffic stop. These are questions of
    law, subject to de novo review for that reason. Woods v. Cole,
    
    181 Ill. 2d 512
    , 516 (1998).
    As for the third issue, there is a question of law at
    issueBwhether dog sniffs in general are so unreliable that they
    should be not allowed at all. We review this question de novo.
    
    Woods, 181 Ill. 2d at 516
    . In addition, we must review the trial
    court=s factual determination that the police dog, Krott, was well
    trained and sufficiently reliable that his alert gave the police
    probable cause to search the trunk of defendant=s car. A[W]hen
    a trial court=s ruling on a motion to suppress evidence involves
    factual determinations and credibility assessments,@ the ruling
    will not be disturbed on appeal unless it is manifestly
    erroneous. 
    Sorenson, 196 Ill. 2d at 431
    .
    History of the ALockstep@ Doctrine in Illinois
    -5-
    When considering the relationship, if any, between the
    meaning of the state constitution and the meaning of the
    federal constitution, there are three possible scenarios. First, a
    provision may be unique to the state constitution and,
    therefore, must be interpreted without reference to a federal
    counterpart. The single-subject rule of the Illinois Constitution
    of 1970 (Ill. Const. 1970, art. IV, '8(d)) is such a provision.
    Second, a provision in the state constitution may be similar
    to a provision in the federal constitution, but differ from it in
    some significant respect. The language of such a provision
    must be given effect. See, e.g., People v. Fitzpatrick, 
    158 Ill. 2d 360
    , 364-65 (1994) (finding a statute unconstitutional because
    it infringed the guarantee of Aface-to-face@ confrontation then
    contained in article I, section 8, of the Illinois Constitution, even
    though the statute would have been deemed constitutional
    under the sixth amendment to the federal constitution). See
    also, e.g., Wash. Const., art. I, '7 (ANo person shall be
    disturbed in his private affairs, or his home invaded, without
    authority of law@); State v. Gunwall, 
    106 Wash. 2d 54
    , 61-63
    
    720 P.2d 808
    , 812-13 (1986) (interpreting this provision to
    provide broader protection than the fourth amendment and
    thus requiring a body of state constitutional jurisprudence
    entirely independent of the fourth amendment).
    Third, the provision in the state constitution may be identical
    to or synonymous with the federal constitutional provision. In
    the present case, we are asked to reconsider this court=s long-
    standing position that the search and seizure clause of article I,
    section 6, of the Illinois Constitution of 1970 should be
    interpreted in the same manner as the virtually identical search
    and seizure clause of the fourth amendment to the United
    States Constitution.
    The search and seizure provision of the Illinois Constitution
    of 1870 provided that:
    AThe right of the people to be secure in their
    persons, houses, papers and effects, against
    unreasonable searches and seizures, shall not be
    violated; and no warrant shall issue without probable
    cause, supported by affidavit, particularly describing the
    -6-
    place to be searched, and the persons or things to be
    seized.@ Ill. Const. 1870, art. II, '6.
    This provision, unlike the search and seizure clauses in the
    constitutions of some other states, did not predate the adoption
    of the federal constitution in 1791. See W. Brennan, State
    Constitutions and the Protection of Individual Rights, 90 Harv.
    L. Rev. 489, 501 (1977) (A[T]he drafters of the federal Bill of
    Rights drew upon corresponding provisions in the various state
    constitutions. Prior to the adoption of the federal Constitution,
    each of the rights eventually recognized in the federal Bill of
    Rights had previously been protected in one or more state
    constitutions@). Rather, this language was clearly modeled
    upon the fourth amendment to the United States Constitution,
    which provides that:
    AThe right of the people to be secure in their
    persons, houses, papers, and effects, against
    unreasonable searches and seizures, shall not be
    violated, and no Warrants shall issue, but upon
    probable cause, supported by Oath or affirmation, and
    particularly describing the place to be searched, and the
    persons or things to be seized.@ U.S. Const., amend. IV.
    See also G. Braden & R. Cohn, The Illinois Constitution: An
    Annotated and Comparative Analysis 28 (1969) (explaining that
    the fourth amendment to the United States Constitution is the
    direct and lineal ancestor of the protection afforded by the
    Illinois Constitution).
    The phrase Asupported by affidavit@ in the state provision
    being virtually synonymous with Aby Oath or affirmation@ in the
    fourth amendment, this court repeatedly held that the two
    constitutions should be construed alike. See People v. Castree,
    
    311 Ill. 392
    , 395 (1924) (AThe fourth amendment to the Federal
    constitution is in practically the same words@); People v.
    Reynolds, 
    350 Ill. 11
    , 16 (1932) (noting that the fourth
    amendment was Athe prototype for section 6 of article 2 of our
    State constitution and no reason is perceived why the latter
    should not receive the same interpretation as the former@);
    People v. Grod, 
    385 Ill. 584
    , 592 (1944) (the guarantees of the
    fourth and fifth amendments Aare in effect the same as sections
    6 and 10 of article II of the Illinois constitution, and are
    -7-
    construed alike@); People v. Tillman, 
    1 Ill. 2d 525
    , 529 (1953)
    (Awhile in somewhat different language,@ the two provisions are
    Ain effect the same@ and should be construed alike); People v.
    Jackson, 
    22 Ill. 2d 382
    , 387 (1961) (restating intention to
    Afollow the decisions of the United States Supreme Court on
    identical State and Federal constitutional problems@).
    In 1961, the United States Supreme Court determined that
    the provisions of the fourth amendment applied to the states
    via the due process clause of the fourteenth amendment. Mapp
    v. Ohio, 
    367 U.S. 643
    , 
    6 L. Ed. 2d 1081
    , 
    81 S. Ct. 1684
    (1961)
    (finding the federal exclusionary rule, based on the fourth
    amendment, applicable to the states via the due process
    clause of the fourteenth amendment). Shortly thereafter, this
    court stated that even before the Mapp decision, it Ahad
    followed the Supreme Court decisions interpreting the fourth
    amendment in our interpretation of section 6 of article II of the
    Illinois constitution,@ and indicated its intent to continue this
    practice. People v. Williams, 
    27 Ill. 2d 542
    , 544 (1963).
    The Alockstep doctrine,@ as it has come to be known, thus
    has deep roots in Illinois and was firmly in place before the
    adoption of the 1970 constitution. This fact would have been
    known to the drafters of the Bill of Rights of the 1970
    constitution, to the constitutional delegates who voted to adopt
    the present language, and to the voters who approved the new
    constitution. See People v. Tisler, 
    103 Ill. 2d 226
    , 241-42
    (1984) (summarizing the committee report, the proceedings of
    the constitutional convention, and the explanation provided to
    voters).
    When the new state constitution was adopted in 1970,
    article II, section 6, was replaced with the following language:
    AThe people shall have the right to be secure in their
    persons, houses, papers, and other possessions
    against unreasonable searches, seizures, invasions of
    privacy or interceptions of communications by
    eavesdropping devices or other means. No warrant
    shall issue without probable cause, supported by
    affidavit particularly describing the place to be searched
    and the persons or things to be seized.@ Ill. Const. 1970,
    art. I, '6.
    -8-
    This provision employs more modern usage (referring to
    Apossessions@ rather than Aeffects@), and a more accessible
    grammatical style (making Apeople@ the subject of the
    sentence, rather than the Aright of the people@). In addition, the
    provision was substantively changed by inclusion of two new
    clauses, each of which created a right not expressly stated in
    the 1870 constitutionBthe right to be secure against
    unreasonable invasions of privacy by the state and the right to
    be secure against unreasonable interceptions of
    communications by the state.
    The question of whether to continue to adhere to the
    lockstep doctrine under the new constitution or to abandon it
    was first considered by this court in People v. Rolfingsmeyer,
    
    101 Ill. 2d 137
    (1984). At issue was whether the implied-
    consent statute of the Illinois Vehicle Code violated the
    protection against compelled self-incrimination contained in the
    fifth amendment to the United States Constitution and, in
    almost identical language, in article I, section 10, of the Illinois
    Constitution of 1970. This court reviewed the proceedings of
    the constitutional convention and found nothing to indicate an
    intent to provide broader protection under the state constitution
    and Aa general recognition and acceptance of interpretations by
    the United States Supreme Court.@ 
    Rolfingsmeyer, 101 Ill. 2d at 142
    . A member of the Bill of Rights Committee explained that
    the committee considered and rejected proposals to alter the
    language of the self-incrimination provision, but decided A >that
    the existing state of the law would remain unchanged.= @
    
    Rolfingsmeyer, 101 Ill. 2d at 142
    , quoting 3 Record of
    Proceedings, Sixth Illinois Constitutional Convention 1376-80
    (hereinafter cited as Proceedings). The existing state of the law
    at that time was lockstep interpretation of identical or nearly
    identical language. In the end, this court held that the implied-
    consent statute did not violate the privilege against self-
    incrimination in either the federal or the state constitution.
    
    Rolfingsmeyer, 101 Ill. 2d at 142
    .
    In a special concurrence, one justice stated many of the
    arguments made by the defendant in the present case. He
    noted that this court is not Abound to automatically follow the
    decisions of the United States Supreme Court interpreting the
    -9-
    comparable provision contained in the fifth amendment of the
    Federal Constitution.@ 
    Rolfingsmeyer, 101 Ill. 2d at 143
    (Simon,
    J., specially concurring). The concurring justice criticized the
    majority for assuming that when the same language appears in
    the two constitutions, it necessarily has same content unless
    some indication to the contrary is found in the report of
    proceedings of the constitutional convention: AThis presumption
    is the reverse of the correct one and inverts the proper
    relationship between the State and Federal constitutions.@
    
    Rolfingsmeyer, 101 Ill. 2d at 143
    (Simon, J., specially
    concurring). In contrast, he asserted, there is Ano evidence in
    the record of proceedings of the Illinois constitutional
    convention to indicate that the framers of article I, section 10,
    intended to limit the content of the self-incrimination clause to
    the precedents of the United States Supreme Court.@
    
    Rolfingsmeyer, 101 Ill. 2d at 144
    (Simon, J., specially
    concurring). Thus, he concluded, the framers of the new state
    constitution Adid not reject further development of the law by
    this court or by the Supreme Court of the United States.@
    
    Rolfingsmeyer, 101 Ill. 2d at 145
    (Simon, J., specially
    concurring).
    Later that same year, the issue surfaced again in the
    context of search and seizure. In People v. Hoskins, 
    101 Ill. 2d 209
    (1984), this court permitted the admission of drugs into
    evidence after they were found in a search of the defendant=s
    purse, which she had either thrown to the ground or dropped
    while fleeing from officers who were attempting to arrest her for
    prostitution. Hoskins was argued and decided as a fourth
    amendment question, but the court added, in dicta, that A[a]ny
    contention that section 6 of the bill of rights in our own
    constitution was to be interpreted differently from the Supreme
    Court=s interpretations of the search provisions of the fourth
    amendment to the United States Constitution cannot be
    supported@ because the Aconstitutional debates do not indicate
    any wish or intent to provide protections against unreasonable
    searches and seizures broader than those existing under
    decisional interpretations under the fourth amendment to the
    United States Constitution.@ 
    Hoskins, 101 Ill. 2d at 218
    . In a
    dissent, the same justice wrote that A[t]he time has come for
    -10-
    the Illinois Supreme Court to recognize its independent
    obligation to interpret the bill of rights contained in the Illinois
    Constitution, and to make its own assessment of the
    appropriate balance between the privacy rights of our citizens
    and the legitimate requirements of law enforcement.@ 
    Hoskins, 101 Ill. 2d at 236
    (Simon, J., dissenting).
    This court=s decision in People v. Tisler, 
    103 Ill. 2d 226
    , 245
    (1984), is generally considered to be the seminal case on the
    question of lockstep interpretation of the search and seizure
    provisions of the two constitutions. Before delving into the
    lockstep analysis in Tisler, however, some background is in
    order.
    In People v. Gates, 
    85 Ill. 2d 376
    (1981), rev=d, Illinois v.
    Gates, 
    462 U.S. 213
    , 
    76 L. Ed. 2d 527
    , 
    103 S. Ct. 2317
    (1983),
    this court applied the two-prong test announced in Aguilar v.
    Texas, 
    378 U.S. 108
    , 
    12 L. Ed. 2d 723
    , 
    84 S. Ct. 1509
    (1964),
    and explained further in Spinelli v. United States, 
    393 U.S. 410
    ,
    
    21 L. Ed. 2d 637
    , 
    89 S. Ct. 584
    (1969), to determine that a
    warrant was not properly issued based on a tip contained in an
    anonymous letter that did not contain any statement showing
    that the author acquired the information through firsthand or
    personal knowledge. At the time our 1970 constitution was
    adopted, the Aguilar-Spinelli test was part of the dual
    state/federal jurisprudence of search and seizure that existed
    under our long-standing lockstep approach. When the
    Supreme Court decided Gates, however, it abandoned the
    Aguilar-Spinelli test in favor of a new totality-of-the-
    circumstances test. 
    Gates, 462 U.S. at 238-39
    , 76 L. Ed. 2d at
    
    548, 103 S. Ct. at 2332
    . This court subsequently applied the
    new, federal Gates test for the existence of probable cause for
    a warrant based on an anonymous tip, but did not expressly
    reject the Aguilar-Spinelli approach. See People v. Exline, 
    98 Ill. 2d 150
    (1983) (upholding the warrant under either the
    Aguilar-Spinelli test or the Gates totality-of-the-circumstances
    test); but see 
    Exline, 98 Ill. 2d at 157-58
    (Goldenhersh, J.,
    dissenting, joined by Simon, J.) (noting that this court is Anot
    required to blindly follow the action taken by the Supreme
    Court in determining the standards applicable under our own
    -11-
    constitution,@ and favoring retention of the Aguilar-Spinelli test
    under the Illinois Constitution).
    In Tisler, unlike in Exline, the question was squarely
    presented when the defendant argued, as a matter of state
    constitutional law, that this court should reject Gates and retain
    Aguilar-Spinelli. 
    Tisler, 103 Ill. 2d at 241
    . This court looked to
    the drafters= choice of search and seizure language Anearly the
    same as that of the fourth amendment,@ the report of the Bill of
    Rights Committee, the record of proceedings, and the
    informational materials distributed to voters to determine that in
    adopting article I, section 6, the constitutional convention
    Amanifested no intent to expand the nature of the protection
    afforded by the fourth amendment.@ 
    Tisler, 103 Ill. 2d at 241
    -
    42. Thus, when this court employed the Aguilar-Spinelli test
    prior to the adoption of the 1970 constitution,
    A[W]e were not establishing the Aguilar test as defining
    the extent of the protection afforded by the Illinois
    Constitution. Those decisions, in effect, held that the
    protection against unreasonable searches under the
    Illinois Constitution is measured by the same standards
    as are used in defining the protection against
    unreasonable searches contained in the fourth
    amendment to the United States Constitution.@ 
    Tisler, 103 Ill. 2d at 243
    .
    Notwithstanding our continued reliance on the lockstep
    approach to the interpretation of the search and seizure
    provision of the state constitution, this court acknowledged that
    it was free to construe the state constitution differently from the
    federal constitution (
    Tisler, 103 Ill. 2d at 243
    ), and formulated a
    test for determining when the state constitution need not be
    interpreted in lockstep with the federal constitution:
    AAfter having accepted the pronouncements of the
    Supreme Court in deciding fourth amendment cases as
    the appropriate construction of the search and seizure
    provisions of the Illinois Constitution for so many years,
    we should not suddenly change course and go our
    separate way simply to accommodate the desire of the
    defendant to circumvent what he perceives as a
    narrowing of his fourth amendment rights under the
    -12-
    Supreme Court=s decision in Illinois v. Gates. Any
    variance between the Supreme Court=s construction of
    the provisions of the fourth amendment in the Federal
    Constitution and similar provisions in the Illinois
    Constitution must be based on more substantial
    grounds. We must find in the language of our
    constitution, or in the debates and the committee
    reports of the constitutional convention, something
    which will indicate that the provisions of our constitution
    are intended to be construed differently than are similar
    provisions in the Federal Constitution, after which they
    are patterned.@ 
    Tisler, 103 Ill. 2d at 245
    .
    A concurring justice noted the Adeveloping interest in State
    constitutionalism@ among legal scholars. 
    Tisler, 103 Ill. 2d at 253
    (Ward, J., concurring). Beginning with the principle that
    when interpreting a constitution, a court must Aascertain and
    give effect to the intent of the framers of it and the citizens who
    have adopted it@ 
    (Tisler, 103 Ill. 2d at 254
    (Ward, J.,
    concurring)), the concurring justice opined that:
    AIf these principles of constitutional construction
    were to be ignored critics not unreasonably would
    declare it judicial arrogance for courts to say that their
    power to construe constitutions was limited only by the
    restraints courts might impose upon themselves. Courts
    are not legislatures, and neither are they constitutional
    framers and adopters of constitutions. What Justice
    Powell said in another context is not without relevance:
    >We should be ever mindful of the contradictions that
    would arise if a democracy were to permit general
    oversight of the elected branches of government by a
    nonrepresentative, and in large measure insulated,
    judicial branch.= @ 
    Tisler, 103 Ill. 2d at 255
    (Ward, J.,
    concurring), quoting United States v. Richardson, 
    418 U.S. 166
    , 188, 
    41 L. Ed. 2d 678
    , 695, 
    94 S. Ct. 2940
    ,
    2952 (1974) (Powell, J., concurring).
    After reviewing the research papers and other materials made
    available to the delegates, the concurring justice concluded
    that they were well informed regarding their ability to expand
    the protections guaranteed by the federal Bill of Rights as
    -13-
    applied to the states through the fourteenth amendment. Based
    on these materials, he further concluded that the delegates
    made a Aconscious decision@ to leave the search and seizure
    provision unchanged but to add two new provisions dealing
    with privacy and eavesdropping. 
    Tisler, 103 Ill. 2d at 255
    -58
    (Ward, J., concurring).
    In subsequent years, this court has often reiterated its intent
    to utilize the lockstep approach when construing the search
    and seizure clause of article I, section 6. See, e.g., People v.
    Mitchell, 
    165 Ill. 2d 211
    , 217-22 (1995) (although a state is free
    to construe its own constitution as providing greater protection
    than comparable provisions in the federal constitution, the
    search and seizure provision of our state constitution was not
    intended to be broader than the search and seizure provision
    of the fourth amendment); People v. Cox, 
    202 Ill. 2d 462
    , 482
    (2002) (reaffirming lockstep principle with respect to the search
    and seizure provision of the state constitution and the fourth
    amendment); People v. Lampitok, 
    207 Ill. 2d
    231, 240-41
    (2003) (noting this court=s long-standing acknowledgment that
    the fourth amendment and the search and seizure provision of
    article I, section 6, of the Illinois Constitution provide Athe same
    level of protection,@ and that unless a successful argument is
    made that in a particular situation the Illinois Constitution
    provides broader protection, Illinois courts will follow United
    States Supreme Court decisions on search and seizure
    issues).
    Nevertheless, this court has, on occasion, departed from
    strict lockstep interpretation when circumstances warrant. In
    People ex rel. Daley v. Joyce, 
    126 Ill. 2d 209
    (1988), the issue
    was the constitutionality of section 115B1 of the Code of
    Criminal Procedure, which provided the State with the right to a
    jury in certain criminal trials. Federal constitutional law
    permitted a statute that required government consent to a
    defendant=s waiver of a jury trial. 
    Joyce, 126 Ill. 2d at 213
    ,
    citing Singer v. United States, 
    380 U.S. 24
    , 
    13 L. Ed. 2d 630
    ,
    
    85 S. Ct. 783
    (1965) (upholding Federal Rule of Criminal
    Procedure 23(a)). If this court had interpreted article I, section
    13, of the state constitution in lockstep with federal
    constitutional law, it would have upheld the constitutionality of
    -14-
    the statute. Instead, this court looked to the language of the
    state constitution, the history of the provisions dealing with the
    right to a jury trial, including the committee reports and
    debates, and the common law decisions of this court with
    respect to jury trials that, the debates revealed, the drafters
    intended to adopt as constitutional principles. Based solely
    upon Illinois constitutional principles, this court found section
    115B1 unconstitutional and held that in a criminal prosecution,
    only the defendant has a right to a jury trial. 
    Joyce, 126 Ill. 2d at 222
    .
    In People v. McCauley, 
    163 Ill. 2d 414
    (1994), this court
    considered whether a defendant=s waiver of his fifth
    amendment right to counsel was valid where he was denied
    access to an attorney hired by his family, and who was present
    at the police station during the interrogation, trying
    unsuccessfully to see him. Based on the Supreme Court=s
    decision in Moran v. Burbine, 
    475 U.S. 412
    , 
    89 L. Ed. 2d 410
    ,
    
    106 S. Ct. 1135
    (1986), this court concluded that the police
    conduct in denying the attorney access to his client did not
    violate the fifth amendment. 
    McCauley, 163 Ill. 2d at 421
    . This
    court went on, however, to consider whether such conduct by
    police violated the due process guarantee of article I, section 2,
    of the state constitution. 
    McCauley, 163 Ill. 2d at 425-47
    . After
    an extensive analysis of this court=s previous decisions,
    decisions of the courts of our sister states, and, most
    importantly, the intent of the drafters of the 1970 constitution
    
    (McCauley, 163 Ill. 2d at 439-40
    ), this court concluded that the
    defendant=s right to due process under the state constitution
    was violated when he was denied the benefit of counsel during
    his custodial interrogation. 
    McCauley, 163 Ill. 2d at 444
    . For
    example, we noted that the debates of the constitutional
    convention revealed an intention that the Athen-existing Federal
    constitutional      principles     regarding     incommunicado
    interrogation@ remain unchanged under the new constitution.
    
    McCauley, 163 Ill. 2d at 439
    . When the Supreme Court
    decided Burbine, it diminished the protections previously
    provided under the fifth amendment right to counsel.
    In McCauley, however, we did not ascribe a different
    interpretation to a provision of the state constitution than the
    -15-
    Supreme Court had ascribed to the corresponding federal
    constitutional provision. Rather, we determined that the police
    conduct at issue implicated state due process concerns.
    McCauley, therefore, does not represent a departure from
    lockstep interpretation of identical or nearly identical language.
    See Relsolelo v. Fisk, 
    198 Ill. 2d 142
    , 150 (2001)
    (distinguishing McCauley and holding that the self-incrimination
    clause of article I, section 10, of the Illinois Constitution is to be
    interpreted in lockstep with the fifth amendment because Athe
    substantial grounds necessary for this court to depart from the
    federal interpretation of the self-incrimination clause are not
    present in this case@).
    In People v. Washington, 
    171 Ill. 2d 475
    (1996), however,
    this court did make an exception to the lockstep doctrine. This
    court held, as a matter of due process under the state
    constitution, that a free-standing claim of innocence is
    cognizable in a proceeding under the state Post-Conviction
    Hearing Act, even though the Supreme Court decided in
    Herrera v. Collins, 
    506 U.S. 390
    , 
    122 L. Ed. 2d 203
    , 
    113 S. Ct. 853
    (1993), that such a claim was not cognizable as a violation
    of due process in a federal habeas corpus proceeding. Several
    grounds for departure from the Supreme Court=s ruling were
    mentioned: Herrera was Aa conflicted decision@; the record of
    proceedings of the constitutional convention did Anot reveal
    anything as to what the drafters intended@ in this context; the
    McCauley decision demonstrated this court=s willingness to
    look to this state=s historical approach to a due process
    question; and refusal to consider a claim of actual innocence
    would be fundamentally unfair and would shock the
    conscience. 
    Washington, 171 Ill. 2d at 485-88
    . A commentator
    characterized this court=s decision in Washington as Aimplicitly
    eschewing lockstep.@ J. Reddy, 1996 Illinois Supreme Court
    Criminal Law Opinions: Not Marching in Lockstep, 85 Ill. B.J.
    270, 270 (1997). Indeed, the dissenting justices in Washington
    criticized the majority for reaching its decision without
    specifically engaging in the analysis Aexemplified in Tisler.@
    
    Washington, 171 Ill. 2d at 500
    (Miller, J., dissenting, joined by
    Bilandic, C.J.).
    -16-
    This court appeared to depart from the lockstep approach in
    People v. Krueger, 
    175 Ill. 2d 60
    (1996), by declining to follow
    the holding of Illinois v. Krull, 
    480 U.S. 340
    , 
    94 L. Ed. 2d 364
    ,
    
    107 S. Ct. 1160
    (1987), which recognized a good-faith
    exception to the exclusionary rule when the search was
    authorized by a statute later determined to be unconstitutional.
    The threshold issue in Krueger was the constitutionality of a
    state statute permitting the issuance of a warrant authorizing
    Ano-knock@ entry into a building where the judge found that the
    occupant had possessed firearms within a reasonable period of
    time prior to the application for the warrant. 
    Krueger, 175 Ill. 2d at 64
    . Citing Tisler, this court engaged in lockstep analysis of
    the fourth amendment and article I, section 6, of the state
    constitution to determine whether the statute was
    constitutional. 
    Krueger, 175 Ill. 2d at 65-69
    . Finding the statute
    unconstitutional under fourth amendment principles, the next
    question was whether the evidence seized during the search
    should be suppressed. This court concluded that the AKrull
    good-faith exception does not comport with article I, section 6,
    of the Illinois Constitution of 1970.@ 
    Krueger, 175 Ill. 2d at 70
    .
    Noting this state=s history of applying the exclusionary rule
    under the state constitution as well as a long-standing tradition
    of barring evidence gathered under the authority of an
    unconstitutional statute, this court rejected the Krull good-faith
    rule as creating a Agrace period for unconstitutional search and
    seizure legislation,@ during which constitutional rights of Illinois
    citizens could be violated with impunity. 
    Krueger, 175 Ill. 2d at 75
    . Thus, this court Aknowingly depart[ed]@ from the lockstep
    tradition to give effect to another traditionBthe exclusion of
    evidence gathered in violation of the state constitution=s
    prohibition of unreasonable searches and seizures. 
    Krueger, 175 Ill. 2d at 74
    , citing People v. Brocamp, 
    307 Ill. 448
    (1923)
    (noting the Supreme Court=s adoption of a federal exclusionary
    rule in Weeks v. United States, 
    232 U.S. 383
    , 
    58 L. Ed. 652
    , 
    34 S. Ct. 341
    (1914), and adopting a similar rule under the state
    constitution).
    The same commentator noted that:
    A[I]n both Washington and Krueger, the court found
    broader protections for Illinois citizens than those
    -17-
    afforded under recent U.S. Supreme Court decisions
    without any showing of a difference in the language of
    the constitutional provisions being construed and
    without any reference to the debates of the Illinois
    Constitutional Convention.@ 85 Ill. B.J. at 271.
    He further opined that this court had Aclearly moved from
    lockstep application to mere deference. That is, the court will
    continue to apply U.S. Supreme Court precedent when it is
    persuasive.@ 85 Ill. B.J. at 271.
    We rejected that reading, however, in People v. Bolden,
    
    197 Ill. 2d 166
    , 179-80 (2001), in which we explained that:
    AWe do not construe Krueger as suggesting that the
    search and seizure clause of article I, section 6, of the
    Illinois Constitution must be interpreted more
    expansively than the corresponding right found in the
    fourth amendment. The exclusionary rule is a judicially
    created remedy, and its history in Illinois may be traced
    to this court=s decision in People v. Brocamp, 
    307 Ill. 448
    (1923).@
    Thus, in Krueger, we did not depart from lockstep
    interpretationBthe challenged statute was unconstitutional
    under both the state and federal constitutions. Krueger was a
    case about remedies. We construed state law as providing a
    remedy for the constitutional violation even though the federal
    constitution did not require one.
    Against the backdrop of this court=s decades-long history of
    lockstep interpretation of cognate provisions of the state and
    federal constitutions, as well as the making of occasional
    exceptions to the lockstep doctrine, we now turn to defendant=s
    argument that we should abandon lockstep entirely and set
    about developing an independent body of state constitutional
    law.
    Continued Adherence to Illinois= Limited Lockstep Doctrine
    Defendant asserts that the lockstep doctrine has been
    adopted by this court as a Agoverning rule,@ rather than a
    Adiscretionary practice.@ He argues for abandonment of this
    approach and states that it is Avital as a matter of state
    -18-
    sovereignty and federalism@ that this court independently
    examine constitutional issues under the state constitution
    rather than consider itself bound by the interpretation of the
    cognate provisions of the United States Constitution by the
    United States Supreme Court. Doing otherwise, he claims, is
    an abandonment by this court of its duty and a forfeiture of the
    sovereignty of the State of Illinois. With specific reference to his
    own claim, defendant notes that our use of the lockstep
    approach results in the Supreme Court=s being able to review
    Apro-defense decisions@ of this court, such as those reversing a
    conviction or affirming the suppression of evidence. He argues
    that this is unfair to defendants who have obtained a favorable
    ruling from an Illinois court when that decision is subsequently
    reversed by the Supreme Court. Our lockstep approach,
    according to defendant, permits Aa state court to avoid
    accountability by hiding behind federal law@ and Adiminishes the
    experimental function that federalism allows.@
    Amicus ISBA also urges this court to reject the lockstep
    doctrine and to develop an independent body of law
    interpreting article I, section 6, of the Illinois Constitution.
    Amicus ACLU maintains that this court=s lockstep approach
    violates the judicial oath and does violence to the principle that
    it is this court=s nondelegable duty to construe and interpret the
    Illinois Constitution. The ACLU states that:
    ABy >harnessing= its interpretation of the Illinois
    Constitution to the United States Supreme Court=s
    jurisprudence, this Court would improperly abdicate its
    non-delegable constitutional duty to >say what the law
    is.= In doing so, this Court would undermine the
    sovereignty and independence of the State of Illinois,
    and degrade both this Court and the rights of Illinois
    citizens.@
    Further, with respect to the particular facts of this case, the
    ACLU asserts:
    AA suspicionless canine sniff undeniably alters the
    scope of a traffic stop, as this investigative technique
    categorically transforms traffic stops into criminal
    investigations. Furthermore, the presence of a drug-
    sniffing dog fundamentally changes the traffic stop from
    -19-
    a minor, unintrusive interaction with law enforcement
    into an intrusive, humiliating, and often intimidating
    encounter. It is also a practice that facilitates racial
    profiling.@
    The ACLU concludes that this court should interpret article I,
    section 6, of the Illinois Constitution to be more protective of
    individual rights than the fourth amendment requires.
    In response, the State points out that nothing in the text or
    history of the search and seizure clause of article I, section 6,
    suggests an intent that it be interpreted differently from the
    fourth amendment, at least in the context of traffic stops or the
    use of trained canines by the police. The State also argues that
    the doctrine of stare decisis weighs heavily in favor of not
    overruling Tisler, Mitchell, Bolden, and their progeny.
    In 1977, just seven years after Illinois adopted its present
    constitution, an influential article by Justice William J. Brennan,
    Jr., appeared in the Harvard Law Review. See 90 Harv. L. Rev.
    489. Justice Brennan urged state courts to view their state
    constitutions as Aa font of individual liberties,@ that is, as a
    source of positive rights and liberties entitled to protection
    beyond that required by the United States Supreme Court=s
    interpretation of the federal constitution. 90 Harv. L. Rev. at
    491. He criticized a trend in decisions of the Court that, in his
    opinion, pulled back from earlier, more protective rulings. 90
    Harv. L. Rev. at 495 & nn.47-51 (and cases cited).
    Justice Brennan further noted, at least with respect to state
    constitutions predating the drafting of the Bill of Rights, that
    these state constitutions were not adopted Ato mirror the
    federal Bill of Rights.@ Rather, he observed that Aprior to the
    adoption of the fourteenth amendment [in 1868], these state
    bills of rights, independently interpreted, were the primary
    restraints on state action since the federal Bill of Rights had
    been held inapplicable.@ 90 Harv. L. Rev. at 501-02.
    In Justice Brennan=s view, many Adoor-closing decisions@
    had unfortunately been rendered by the Court in the name of
    federalism. The Court, he said, had Acondoned both isolated
    and systematic violations of civil liberties.@ 90 Harv. L. Rev. at
    502. Justice Brennan concluded by urging state courts to Astep
    -20-
    into the breach@ and to give effect to state constitutions that
    provide Aa double source of protection for the rights of our
    citizens.@ 90 Harv. L. Rev. at 503.
    Thus began the scholarly debate regarding the relationship
    between cognate provisions of the state and federal
    constitutions. The approach urged by Justice Brennan was
    criticized as Aprogrammatic@ and Aresult-oriented.@ L. Friedman,
    The Constitutional Value of Dialogue and the New Judicial
    Federalism, 28 Hastings Const. L.Q. 93, 94 (2000). It was
    suggested that Justice Brennan=s encouragement of the rise of
    state constitutionalism was merely a response to the changing
    make-up of the Court. See 28 Hastings Const. L.Q. at 94 n.3.
    See also W. Brennan, The Bill of Rights and the States: The
    Revival of State Constitutions as Guardians of Individual
    Rights, 61 N.Y.U. L. Rev. 535, 547-48 (1986) (noting Aan
    unmistakable trend in the Court to read the guarantees of
    individual liberty restrictively, which means that the content of
    the rights applied to the states is likewise diminished@; and that
    Athe Court=s contraction of federal rights and remedies on
    grounds of federalism should be interpreted as a plain
    invitation to state courts to step into the breach@).
    Other authors and some state supreme courts embraced
    Brennan=s call for a Anew judicial federalism.@ See 28 Hastings
    Const. L.Q. at 94 nn.4, 5. In this view, courts that find it
    unnecessary to distinguish between state and federal
    constitutional provisions when they use the same language
    Areduce[ ] state constitutional law to a redundancy and greatly
    discourage[ ] its use and development.@ J. Gardner, The Failed
    Discourse of State Constitutionalism, 
    90 Mich. L
    . Rev. 761, 804
    (1992). Defendant bases his argument, in large part, on T.
    McAffee, The Illinois Bill of Rights And Our Independent Legal
    Tradition: A Critique Of The Illinois Lockstep Doctrine, 12 S.I.U.
    L.J. 1, 87 (1987) (urging the Illinois Supreme Court to abandon
    lockstep analysis of constitutional issues because lockstep
    Alimit[s] the judicial role in giving effect to the promise held out@
    by the guarantees of the state constitution).
    Both before and since Justice Brennan=s call to action, state
    courts have adopted various methods for construing cognate
    provisions of the state and federal constitutions. One method is
    -21-
    the lockstep approach, by which the state court binds itself to
    following prior Supreme Court interpretation of the federal
    constitutional text.
    AUnder the lockstep approach, the state
    constitutional analysis begins and ends with
    consideration of the U.S. Supreme Court=s interpretation
    of the textual provision at issue. On this approach,
    federal rulings are regarded as having attained >a
    presumption of correctness= from which the state should
    be loathe to part. In other words, congruence with
    federal decisional law is assumed to be the norm, and
    deviation is for all intents and purposes impossible.
    Such an approach is justified, at least in regard to the
    enforcement of the criminal law, by an interest in
    uniformity, which urges the development of identical
    state and federal rules to control government conduct in
    regard to procedural issues.@ 28 Hastings Const. L.Q. at
    102-03.
    A second approach is based on the application of criteria by
    the state court to determine whether factors unique to the state
    weigh in favor of departing from the Supreme Court=s
    interpretation of the same constitutional language. This has
    been referred to the Ainterstitial approach.@ 
    90 Mich. L
    . Rev. at
    774.
    AUnder the interstitial approach, the court asks first
    whether the right being asserted is protected under the
    federal constitution. If it is, then the state constitutional
    claim is not reached. If it is not, then the state
    constitution is examined. [Citation.] A state court
    adopting this approach may diverge from federal
    precedent for three reasons: a flawed federal analysis,
    structural differences between state and federal
    government, or distinctive state characteristics.@ State v.
    Gomez, 
    122 N.M. 777
    , 783, 
    932 P.2d 1
    , 7 (1997).
    Other sources describe the interstitial approach as a state
    court=s turning to the state constitution for guidance only Aif
    federal constitutional law approves the challenged state action,
    or is ambiguous.@ 
    90 Mich. L
    . Rev. at 774-75. Under either of
    these formulations of the interstitial approach, the focus of
    -22-
    constitutional inquiry is on Athe ways in which the state and
    federal constitutions differ.@ Federal constitutional decisions are
    the starting point, and the party urging greater protection than
    federal law affords must argue that the state and federal
    constitutions Adiffer in dispositive ways.@ 
    90 Mich. L
    . Rev. at
    777-78.
    A third approach, that urged by defendant and his amici, is
    the primacy or primary approach, under which Athe state court
    undertakes an independent [state] constitutional analysis,
    using all the tools appropriate to the task, and relying upon
    federal decisional law only for guidance.@ 28 Hastings Const.
    L.Q. at 95.
    When a state court employs the interstitial approach or the
    primacy approach, it can insulate its decision from Supreme
    Court review by stating Aclearly and expressly that it is
    alternatively based on bona fide, separate, adequate, and
    independent [state] grounds.@ Michigan v. Long, 463 U.S.1032,
    1041, 
    77 L. Ed. 2d 1201
    , 1214, 
    103 S. Ct. 3469
    , 3476 (1983).
    This court=s approach to analysis of cognate provisions in
    the Illinois and United States Constitutions has been described
    as Alockstep.@ Indeed, this court itself has employed this term.
    However, on further consideration, it is clear that it is an
    overstatement to describe our approach as being in strict
    lockstep with the Supreme Court. The approach that this court
    has taken is more properly described as either an interstitial or
    perhaps a limited lockstep approach. While we have not
    unequivocally adopted the interstitial approach as it has been
    broadly defined by the New Mexico court 
    (Gomez, 122 N.M. at 783
    , 932 P.2d at 7), we have, at the very least, embraced a
    narrow version of the interstitial approach, under which we
    recognize several justifications for departing from strict
    lockstep analysis. This approach has been described as one
    under which a court will A >assume the dominance of federal
    law and focus directly on the gap-filling potential= @ of the state
    constitution. 28 Hastings Const. L.Q. at 104, quoting
    Developments in the LawBThe Interpretation of State
    Constitutional Rights, 95 Harv. L. Rev. 1324, 1357 (1982).
    Under this approach, this court will Alook first to the federal
    constitution, and only if federal law provides no relief turn to the
    -23-
    state constitution to determine whether a specific criterionBfor
    example, unique state history or state experienceBjustifies
    departure from federal precedent.@ 28 Hastings Const. L.Q. at
    104. To avoid confusing this court=s approach with the very
    broad definition of the interstitial approach adopted by some
    courts, we shall refer to it, for lack of a better term, as our
    Alimited lockstep approach.@
    States applying the interstitial or criteria approach have
    adopted various criteria. New Jersey courts, for example, will
    look to the textual language (whether there is any significant
    difference between the phrasing of the state and federal
    provisions), the legislative history of the state constitutional
    provision, preexisting state law, state traditions, and public
    attitudes. See State v. Hunt, 
    91 N.J. 338
    , 363-68, 
    450 A.2d 952
    , 965-67 (1982) (concluding that with respect to telephone
    billing records, the state constitution did provide greater privacy
    rights than the federal constitution).
    The criteria adopted by this court in Tisler are somewhat
    more limited:
    AWe must find in the language of our constitution, or in
    the debates and the committee reports of the
    constitutional convention, something which will indicate
    that the provisions of our constitution are intended to be
    construed differently than are similar provisions in the
    Federal Constitution, after which they are patterned.@
    
    Tisler, 103 Ill. 2d at 245
    .
    See also 28 Hastings Const. L.Q. at 105 (noting that the
    criteria used to decide when a departure from lockstep is
    justified Aneed not be uniform from jurisdiction to jurisdiction,@
    and using the criteria formulated in Tisler and cited in DiGuida
    as an example), citing People v. DiGuida, 
    152 Ill. 2d 104
    (1992).
    In Krueger, without expressly stating that we were adopting
    additional criteria, we nevertheless found that state tradition
    and preexisting state law, as set out in Brocamp, necessitated
    the application of the state exclusionary rule, even though no
    remedy for the underlying constitutional violation was required
    under the fourth amendment. Similarly, in Washington, we
    -24-
    looked to our state=s traditions and values to determine that
    denial of a new trial on the basis of evidence of actual
    innocence would be fundamentally unfair and would shock the
    conscience. 
    Washington, 171 Ill. 2d at 487-88
    .
    Defendant calls our attention to decisions of the high courts
    of several of our sister states, in which the strict lockstep
    doctrine has been rejected. In State v. Russell, 
    477 N.W.2d 886
    , 889 n.3 (Minn. 1991), the Minnesota Supreme Court
    employed a more stringent standard of review than mere
    rational basis in its equal protection analysis under the state
    constitution, although the Astate constitution embodies
    principles of equal protection synonymous to the equal
    protection clause of the Fourteenth Amendment.@
    In State v. Sullivan, 
    348 Ark. 647
    , 649-52, 
    74 S.W.3d 215
    ,
    217-18 (2002), Arkansas= highest court declined to follow the
    decision of the United States Supreme Court in Whren v.
    United States, 
    517 U.S. 806
    , 
    135 L. Ed. 2d 89
    , 
    116 S. Ct. 1769
    (1996), and held, as a matter of state constitutional law, that a
    pretexual arrest is unreasonable police conduct warranting
    application of the exclusionary rule. The Arkansas court noted
    that the wording of the state search and seizure provision and
    the fourth amendment=s search and seizure provision are
    Avirtually identical@ and that in some contexts, it had interpreted
    the words in lockstep. 
    Sullivan, 348 Ark. at 650-51
    , 74 S.W.3d
    at 217-18. However, the court noted that in other contexts it
    would Aprovide more protection under the Arkansas
    Constitution than that provided by the federal courts.@ 
    Sullivan, 348 Ark. at 652
    , 74 S.W.3d at 218. The Apivotal inquiry in this
    regard@ was Awhether this court has traditionally viewed an
    issue differently than the federal courts.@ Because the
    Arkansas court had Aconsidered pretextual arrests to be
    unreasonable for over twenty years,@ the remedy of application
    of the exclusionary rule was proper. 
    Sullivan, 348 Ark. at 652
    ,
    74 S.W.3d at 218-19. We note that this result is not unlike this
    court=s decision in Krueger, in which a long-standing state
    tradition mandated application of the exclusionary rule.
    Finally, in State v. Gomez, 
    122 N.M. 777
    , 
    932 P.2d 1
    (1997), the issue was whether a warrantless search of a
    parked car and its contents, performed after the arrest of the
    -25-
    car=s owner, required a particularized showing of exigent
    circumstances to be permissible under the state constitution.
    
    Gomez, 122 N.M. at 780-81
    , 932 P.2d at 4-5. The Supreme
    Court of New Mexico rejected the primacy approach and
    specifically adopted the interstitial approach to state
    constitutional interpretation because:
    A >[w]hen federal protections are extensive and well-
    articulated, state court decisionmaking that eschews
    consideration of, or reliance on, federal doctrine not only
    will often be an inefficient route to an inevitable result,
    but also will lack the cogency that a reasoned reaction
    to the federal view could provide, particularly when
    parallel federal issues have been exhaustively
    discussed by the United States Supreme Court and
    commentators.= @ Gomez, 122 N.M. at 
    783, 932 P.2d at 7
    , quoting 95 Harv. L. Rev. at 1357.
    The New Mexico court found that the interstitial approach
    effectively advanced the goal of preserving national uniformity
    in the development and application of the fundamental rights
    guaranteed by both the state and federal constitutions. 
    Gomez, 122 N.M. at 784
    , 932 P.2d at 8.
    In sum, on the basis of the scholarly literature, the practices
    of other states, and public policy, defendant and his amici
    argue for abandonment of the limited lockstep approach taken
    by this court in the past and for adoption of the primacy
    approach, under which this court would begin to write on an
    essentially blank slate a jurisprudence of state constitutional
    law without regard to federal decisional law except, perhaps, as
    persuasive authority. See 28 Hastings Const. L.Q. at 106-08
    (describing the process of primary state constitutional
    analysis).
    This argument implicates the principle of stare decisis,
    which Aexpresses the policy of the courts to stand by
    precedents and not to disturb settled points.@ Neff v. George,
    
    364 Ill. 306
    , 308-09 (1936). Thus, we have expressed our
    agreement with the United States Supreme Court=s
    pronouncements on this matter: A >Adhering to precedent Ais
    usually the wise policy, because in most matters it is more
    important that the applicable rule of law be settled than it be
    -26-
    settled right.@ [Citation.]= @ People v. Jones, 
    207 Ill. 2d
    122, 134
    (2003), quoting Payne v. Tennessee, 
    501 U.S. 808
    , 827, 
    115 L. Ed. 2d 720
    , 737, 
    111 S. Ct. 2597
    , 2609 (1991), quoting
    Burnet v. Coronado Oil & Gas Co., 
    285 U.S. 393
    , 406, 76 L.
    Ed. 815, 823, 
    52 S. Ct. 443
    , 447 (1932).
    In the end, we reaffirm our commitment to limited lockstep
    analysis not only because we feel constrained to do so by the
    doctrine of stare decisis, but because the limited lockstep
    approach continues to reflect our understanding of the intent of
    the framers of the Illinois Constitution of 1970. This court=s
    jurisprudence of state constitutional law cannot be predicated
    on trends in legal scholarship, the actions of our sister states, a
    desire to bring about a change in the law, or a sense of
    deference to the nation=s highest court. See 
    Tisler, 103 Ill. 2d at 255
    (Ward, J., concurring) (noting that if the court were to stray
    from established principles of constitutional construction Acritics
    not unreasonably would declare it judicial arrogance for courts
    to say that their power to construe constitutions was limited
    only by the restraints courts might impose upon themselves@).
    This court=s jurisprudence of state constitutional law is not
    affected by trends in legal scholarship; it is not governed by the
    actions of our sister states; it is not influenced by a desire to
    bring about change in the law or by a sense of deference to the
    nation=s highest court. Rather, our choice of a rule of decision
    on matters governed by both the state and federal constitutions
    has always been and must continue to be predicated on our
    best assessment of the intent of the drafters, the delegates,
    and the votersBthis is our solemn obligation.
    In keeping with this obligation, and based on its
    understanding of the intent of the drafters, this court adopted a
    limited lockstep approach in Tisler and modified it in Krueger
    and Washington to allow consideration of state tradition and
    values as reflected by long-standing state case precedent. This
    limited lockstep approach is not a surrender of state
    sovereignty or an abandonment of the judicial function. It is,
    instead, based on the premise that the drafters of the 1970
    constitution and the delegates to the constitutional convention
    intended the phrase Asearch and seizure@ in the state
    -27-
    document to mean, in general, what the same phrase means in
    the federal constitution.
    Application of the Limited Lockstep Doctrine
    Defendant argues that, notwithstanding the United States
    Supreme Court=s interpretation of the search and seizure
    clause of the fourth amendment, this court should consider a
    canine sniff to be a Asearch,@ within the meaning of article I,
    section 6. He observes, correctly, that state courts are free to
    independently construe their state constitutions to provide
    more protection than the federal constitution. He offers
    decisions from the courts of our sister states that have imposed
    a requirement of reasonable, articulable suspicion of criminal
    activity before a dog sniff may be conducted.
    In State v. Carter, 
    697 N.W.2d 199
    , 210 (Minn. 2005), the
    Supreme Court of Minnesota held that a dog sniff of a self-
    storage unit was a search within the meaning of the article I,
    section 10, of the Minnesota Constitution. This provision is
    virtually identical to the fourth amendment (see Minn. Const.,
    art. 1, '10), but under Minnesota law, decisions of the United
    States Supreme Court interpreting the language are merely
    persuasive, not authoritative. 
    Carter, 697 N.W.2d at 210
    .
    The Supreme Court of Pennsylvania ruled in
    Commonwealth v. Johnston, 
    515 Pa. 454
    , 466, 
    530 A.2d 74
    ,
    79 (1987), that although a dog sniff of the outside of a storage
    locker was not a search for fourth amendment purposes, it
    nevertheless violates state law unless the police are Aable to
    articulate reasonable grounds for believing that drugs may be
    present in the place they seek to test,@ and Athe police are
    lawfully present in the place where the canine sniff is
    conducted.@ Under this holding, the police are not permitted to
    use a narcotics-detection dog or Aany other crime detection
    device, at random and without reason.@ 
    Johnston, 515 Pa. at 465
    , 530 A.2d at 79. The wording of article I, section 8, of the
    Pennsylvania Constitution is also almost identical to that of the
    fourth amendment. See Pa. Const., art. 1, '8.
    Finally, defendant cites McGahan v. State, 
    807 P.2d 506
    (Alaska App. 1991), another case in which a state court held
    -28-
    that its state constitution requires police officers to have
    reasonable suspicion before conducting a warrantless canine
    sniff of the exterior of a warehouse. A previous appellate court
    decision in that state had held that a canine sniff of luggage
    was a search under the Alaska Constitution. 
    McGahan, 807 P.2d at 509
    , citing Pooley v. State, 
    705 P.2d 1293
    , 1311
    (Alaska App. 1985). Again, the language of article 1, section 14
    of the Alaska Constitution tracks the language of the fourth
    amendment. See Alaska Const., art. 1, '14.
    In each of these cases, a state court construed a state
    constitutional provision that does not differ in any significant
    respect from the fourth amendment to reach the result urged
    by defendant. However, in light of our continued adherence to
    the lockstep doctrine, albeit with some room for flexibility, these
    cases do not persuade us to construe the search and seizure
    clause of our constitution any more broadly than the search
    and seizure clause of the fourth amendment.
    We further conclude that defendant has not made a case
    for an exception to the lockstep doctrine. Nothing in the
    language of article I, section 6, or in the history of the
    constitutional debates suggests an intent that the use of trained
    dogs by the police be considered an unreasonable search or
    seizure. Indeed, the drafters were no doubt aware of a long
    history of police use of trained dogs for a variety of purposes,
    from search and rescue to the tracking of both lost children and
    fleeing felons.
    Despite defendant=s arguments that the people of the State
    of Illinois will be best served by an expansive reading of the
    search and seizure clause of our constitution and by insulating
    Apro-defense@ decisions from further review and possible
    reversal, we note that the people of this state have a stake in
    both sides of this debate. Indeed, this prosecution was brought
    in the name of the People of the State of Illinois, who are well
    served when law enforcement officers are able to detect the
    presence of illegal narcotics and to arrest those who violate the
    law. The people are also well served when law enforcement
    officers and other state actors are constrained from intruding
    upon the privacy of individuals.
    -29-
    We conclude that the search and seizure clause of article I,
    section 6, of the state constitution, as construed under our
    limited lockstep approach, strikes the proper balance between
    protecting the people from unreasonable intrusion by the state
    and providing the people with effective law enforcement. We
    will not depart from the intent of the framers of the Illinois
    Constitution of 1970 or the understanding of voters who
    adopted itBto the extent we are able to discern it from the
    language used, the committee comments, and the debateBto
    tip the balance in favor of expanding the scope of the right to
    be free from unreasonable searches and seizures that is
    already guaranteed by the fourth amendment. The expansion
    of the protections guaranteed by the state constitution can be
    brought about by amending the constitution or by the
    enactment of statutes by the General Assembly. Such
    expansion of rights, however, is not the function of this court.
    We comment, briefly, on the assertions made by defendant
    and his amici regarding the potential for abuse and racial
    profiling in the use of police dogs. These concerns, while
    weighty, are not at issue here. Further, such problems, where
    they exist, are not to be remedied by finding the reasonable
    use of canines for the purpose of detection of contraband
    unconstitutional under the search and seizure clause.
    Dog Sniffs as a Violation of the Privacy Clause
    Article I, section 6, of the Illinois Constitution of 1970, in
    addition to prohibiting unreasonable searches and seizures,
    prohibits Aunreasonable *** invasions of privacy or interceptions
    of communications by eavesdropping devices or other means.@
    Ill. Const. 1970, art. I, '6. The additional language Aexpands
    upon the individual rights which were contained in Section 6 of
    Article II of the 1870 Constitution and the guarantees of the
    Fourth and Fourteenth Amendments to the United States
    Constitution.@ ILCS Ann., Ill. Const. 1970, art. I, '6,
    Constitutional Commentary, at 522 (Smith-Hurd 1993). Further,
    the protection against unreasonable invasions of privacy Ais
    stated broadly,@ and A[n]o definition of types of privacy@
    intended to be protected Ais offered.@ ILCS Ann., Ill. Const.
    1970, art. I, '6, Constitutional Commentary, at 522 (Smith-Hurd
    -30-
    1993). This language was recommended to the Constitutional
    Committee by the Bill of Rights Committee, accompanied by a
    committee report stating:
    AIt is doubtless inevitable that any person who
    chooses to enjoy the benefits of living in an organized
    society cannot also claim the privacy he would enjoy if
    he were to live away from the institutions of government
    and the multitudes of his fellow men. It is probably also
    inevitable that infringements on individual privacy will
    increase as our society becomes more complex, as
    government institutions are expected to assume larger
    responsibilities, and as technological developments
    offer additional or more effective means by which
    privacy can be invaded. In the face of these conditions,
    the Committee concluded that it was essential to the
    dignity and well being of the individual that every person
    be guaranteed a zone of privacy in which his thoughts
    and highly personal behavior were not subject to
    disclosure or review. The new provision creates a direct
    right to freedom from such invasions of privacy by
    government or public officials.@
    The search and seizure provision of article I, section 6, was
    intended to add Anothing new or no new concepts.@ 3
    Proceedings 1523 (comment of Committee Member Dvorak).
    The clause creating an additional right to privacy, however,
    was added to article I, section 6, in response to a concern that
    the government might use newly available technology to
    develop Aa general information bank@ that would collect and
    monitor personal information. 3 Proceedings 1525. In response
    to a delegate=s question about the sorts of invasions of privacy
    that would fall within the scope of the privacy clause, a
    committee member gave the example of a governmental
    employer creating a peephole into a women=s washroom to
    observe an employee suspected of theft. AThis could be
    considered an invasion of one=s privacy.@ 3 Proceedings 1530.
    The delegates considered an amendment from the floor
    that would have stricken the privacy clause from article I,
    section 6. During the debate on this amendment, the chairman
    of the Bill of Rights Committee commented:
    -31-
    AWe recognize in our report that in this kind of
    crowded, complicated world that there are necessarily a
    lot of invasions of privacyBthat some of those invasions
    are reasonable. All we are saying, without spelling out in
    detail, is that a halt ought to be called somewhere to
    these invasions of privacy. The individual ought not to
    be completely at the mercy of the state. *** And the
    purpose obviously of this provision is to cover those
    situations that aren=t covered by the other parts of the
    proposed section 6.@ (Emphasis added.) 3 Proceedings
    1535 (comment of Chairman Gertz).
    The chairman offered the example of devices that could
    Apenetrate walls and can view what=s going on@ inside a
    person=s home, revealing Abedtime intimacies and private
    conversations,@ as the kind of unreasonable invasion of privacy
    that should be prohibited. 3 Proceedings 1535. The
    amendment failed and the privacy clause became a part of our
    state constitution.
    Defendant argues that a canine sniff invades the zone of
    privacy guaranteed by the privacy clause of article I, section 6,
    and offends the dignity and well-being of the subject of the
    sniff. Thus, he argues that the privacy clause should be
    interpreted by this court to require the existence of Aspecific
    and articulable facts@ suggesting drug activity before a canine
    sniff can be conducted during a routine traffic stop. Defendant
    asserts that this court=s reasoning in Caballes I was correct,
    erring only in that it was based on a fourth amendment analysis
    rather than on an analysis of article I, section 6. Specifically, he
    argues that the constitutional commentary indicates the
    drafters= intent to create a zone of personal privacy free from
    disclosure or review and that a canine sniff subjects a citizen=s
    behavior to disclosure and review, in violation of the clause. He
    does not, however, describe how an individual=s private
    behavior is revealed when his vehicle is circled by a police
    officer and a trained narcotics-detection dog. He further asserts
    that a canine search during at traffic stop Acasts a pall of
    suspicion over innocent people.@
    Amicus ISBA suggests that the transcript of the
    proceedings of the constitutional convention reveals the
    -32-
    drafters= intent to provide greater protections under the privacy
    clause than are guaranteed under the search and seizure
    clauses of the state and federal constitutions. Amicus ACLU
    claims that this court Ahas consistently applied the Privacy
    Clause to more sophisticated techniques that allow the State to
    gather and analyze data not available by employing ordinary
    unenhanced human sensory capacities.@ Amicus ACLU states
    that this court has Acreated a false dichotomy between search
    and seizure claims and privacy claims,@ which is Ais
    unnecessary and too broad.@ The ACLU also contends that this
    dichotomy makes the privacy clause Aa meaningless nullity in
    all criminal contexts,@ because this court analyzes any
    investigative device or technique that invades privacy interests
    under the search and seizure clause rather than under the
    privacy clause.
    The State responds that the privacy clause is not implicated
    in the present case because this court=s previous decisions
    dictate that the police conduct at issue should be analyzed only
    under the search and seizure clause. Further, the State argues
    that if this court were to apply the privacy clause in the context
    of a traffic stop, defendant had no reasonable expectation of
    privacy in odors emanating from his vehicle, even if those
    odors were not detectable by an officer without the assistance
    of a trained dog.
    Our analysis must begin with this court=s decision in In re
    May 1991 Will County Grand Jury, 
    152 Ill. 2d 381
    (1992). At
    issue in Will County Grand Jury were grand jury subpoenas
    ordering two individuals, against whom no charges had been
    filed, to appear in a lineup and to submit fingerprints, palm
    prints, and samples of blood, head hair, and pubic hair. Will
    County Grand 
    Jury, 152 Ill. 2d at 385
    . This court noted that
    A[e]ven before the adoption of the 1970 Constitution,@ its
    decisions had provided protection for individual privacy rights in
    books and records. Will County Grand 
    Jury, 152 Ill. 2d at 391
    .
    Just as a person has a reasonable expectation that his private
    records will not be exposed to public view, he has a similarly
    reasonable expectation Athat he will not be forced to submit to
    a close scrutiny of his personal characteristics, unless for a
    valid reason.@ Will County Grand 
    Jury, 152 Ill. 2d at 391
    -92.
    -33-
    This court concluded, therefore, that a grand jury=s ability to
    gather such evidence implicated not only the fourth
    amendment but also the privacy clause of article I, section 6, of
    the state constitution. Will County Grand 
    Jury, 152 Ill. 2d at 389-91
    .
    Once the right to privacy under article I, section 6, is
    established, the court must determine whether the state=s
    invasion of individual privacy is reasonable. In the context of a
    grand jury investigation, reasonableness is determined by
    balancing Athe interest of the individual in maintaining his
    privacy against the interest of the public in preserving the
    effectiveness of the grand jury.@ Will County Grand 
    Jury, 152 Ill. 2d at 392
    . Under this analysis, a grand jury may not
    subpoena documents unless they are relevant to the
    investigation. Will County Grand 
    Jury, 152 Ill. 2d at 393
    . A
    grand jury seeking physical evidence of a noninvasive nature,
    such as requiring an individual to appear in a lineup or to
    submit to fingerprinting, must make Asome showing of
    individualized suspicion as well as relevance.@ Will County
    Grand 
    Jury, 152 Ill. 2d at 393
    . The taking of hair samples,
    however, deserves greater scrutiny. The taking of hair samples
    from an individual=s head Ais more of an intrusion into individual
    privacy than is the direction to appear in a lineup or to provide
    fingerprints.@ Will County Grand 
    Jury, 152 Ill. 2d at 399
    .
    Although head hair is a physical characteristic observable by
    the public, an individual Adoes not ordinarily have the
    expectation that others will cut, pull or comb his hair without his
    permission, and thus he has a greater expectation of privacy in
    keeping his hair intact than he does in simply having it
    observed.@ Will County Grand 
    Jury, 152 Ill. 2d at 399
    . The
    taking of hair samples Adiminishes the body@ of the individual,
    Aalbeit to a small degree.@ Will County Grand 
    Jury, 152 Ill. 2d at 399
    . Thus, a subpoena for the production of samples of head
    hair Aunsupported by probable cause, is an unreasonable
    violation of the right to privacy protected by the Illinois
    Constitution.@ Will County Grand 
    Jury, 152 Ill. 2d at 399
    . With
    regard to samples of pubic hair, the violation of the right to
    privacy is even more clear. The pubic area Ais normally hidden
    from the view of others,@ and the Ademand for pubic hair
    -34-
    represents a considerable intrusion into personal privacy,@
    which must be justified by a showing of probable cause. Will
    County Grand 
    Jury, 152 Ill. 2d at 395
    . Our decision in Will
    County Grand Jury thus established a continuum of privacy
    protectionsBfrom mere relevance, to relevance plus
    individualized suspicion, to probable causeBdepending on the
    degree of intrusiveness of the grand jury=s inquiry.
    In the wake of Will County Grand Jury, the privacy clause of
    article I, section 6, has been invoked in various contexts. In
    one group of cases, this court has applied the two-part analysis
    of Will County Grand Jury to determine whether the privacy
    clause is implicated in the particular context of the claim and,
    then, if necessary, gone on to consider the reasonableness of
    the invasion. The two contexts in which this analysis has been
    undertaken have involved either the State=s effort to obtain
    access to personal documents and records or the information
    contained therein or to engage in Aclose scrutiny of [the]
    personal characteristics@ of an individual. As we noted in Will
    County Grand Jury, Athe individual=s privacy interest in his
    physical person, as well as his privacy interest in his
    documents, must be protected.@ Will County Grand 
    Jury, 152 Ill. 2d at 391
    -92.
    In the other group of cases, although a party argued that
    the privacy clause was implicated, this court determined that
    the situation should instead be examined entirely under
    traditional search and seizure principles. These cases have not
    involved either the exposure of personal information or close
    scrutiny of personal characteristics. These are the cases that
    amicus ACLU describes as having created Aa false dichotomy
    between search and seizure claims and privacy claims.@
    The first group of cases includes King v. Ryan, 
    153 Ill. 2d 449
    (1992), Fink v. Ryan, 
    174 Ill. 2d 302
    (1996), Kunkel v.
    Walton, 
    179 Ill. 2d 519
    (1997), Best v. Taylor Machine Works,
    
    179 Ill. 2d 367
    (1997), Burger v. Lutheran General Hospital,
    
    198 Ill. 2d 21
    (2001), and People v. Cornelius, 
    213 Ill. 2d 178
    (2004).
    In King, this court declared unconstitutional a statute
    authorizing the chemical testing of the blood, breath, or urine of
    an individual who had been in control of a vehicle involved in
    -35-
    an accident causing personal injury or death. The flawed
    statute required only probable cause to believe that the driver
    had been at fault, in whole or in part, for the accident. There
    was no requirement that there be even the slightest indication
    the driver was intoxicated. Refusal to submit to the test
    resulted in suspension of the individual=s driver=s license. 
    King, 153 Ill. 2d at 455-56
    . This court concluded that the statute
    violated the fourth amendment because it failed to require
    probable cause of intoxication before the police could gather
    such evidence for use in a possible criminal proceeding. 
    King, 153 Ill. 2d at 458-64
    . This court then considered the plaintiff=s
    additional argument that the statute violated the privacy clause
    of article I, section 6, of the Illinois Constitution of 1970.
    Referring to our decision in Will County Grand Jury, this court
    stated that Arequiring a urine sample is more intrusive than
    cutting a person=s hair@ and Aa chemical analysis of an
    individual=s breath is at least as intrusive as requiring a hair
    sample for testing.@ 
    King, 153 Ill. 2d at 464
    . It followed,
    therefore, that the chemical tests the statute purported to
    authorize could not be conducted absent probable cause to
    believe the individual had committed a crime. 
    King, 153 Ill. 2d at 464
    -65.
    Subsequently, the legislature enacted a modified version of
    the invalidated statute, authorizing the testing of blood, breath,
    or urine of the driver of a vehicle involved in a personal injury
    or fatal accident, but only if the individual is arrested. In Fink,
    this court determined that the successor statute passed
    constitutional muster under both the fourth amendment and the
    state constitution. Under the successor statute, no driver can
    be chemically tested unless he has been arrested, based on
    probable cause, for a nonequipment violation of the Vehicle
    Code. 
    Fink, 174 Ill. 2d at 315
    . With respect to the privacy
    clause of article I, section 6, this court concluded that, as a
    result, the Adriver=s zone of privacy is not unconstitutionally
    invaded@ when he is chemically tested pursuant to the statute.
    
    Fink, 174 Ill. 2d at 315
    .
    In Kunkel, this court considered the constitutionality of
    section 2B1003(a) of the Code of Civil Procedure (735 ILCS
    5/2B1003(a) (West 1994)), which had been amended as part of
    -36-
    the Civil Justice Reform Amendments of 1995 (Pub. Act 89B7,
    eff. March 9, 1995). After concluding that amended section
    2B1003(a) violated the separation of powers clause of article II,
    section 1, of the Illinois Constitution of 1970 
    (Kunkel, 179 Ill. 2d at 536-37
    ), this court went on to consider an alternate basis for
    declaring the amended statute unconstitutionalBthat it violated
    Athe right to privacy expressly set forth in our state
    constitution.@ 
    Kunkel, 179 Ill. 2d at 537
    . The privacy clause of
    article I, section 6, was implicated because the amended
    statute provided that any party alleging bodily injury or disease
    was deemed to waive any privilege of confidentiality with his or
    her health-care providers. The amended statute further
    provided that upon the request of any party, the party claiming
    such injury or disease shall sign and deliver consent forms
    authorizing his or her health-care providers to disclose medical
    records to the requesting party and to engage in ex parte
    conferences with the requesting party=s attorney. 
    Kunkel, 179 Ill. 2d at 524-25
    . This court noted that the Aconfidentiality of
    personal medical information is, without question, at the core of
    what society regards as a fundamental component of individual
    privacy.@ 
    Kunkel, 179 Ill. 2d at 537
    . Indeed, such information is
    generally contained in the very type of personal record or
    document that this court protected even prior to the enactment
    of the 1970 constitution. See Will County Grand Jury, 
    152 Ill. 2d
    at 391. Such information is no less deserving of protection
    merely because it may be obtained directly from a health-care
    provider rather than from confidential medical records.
    Citing the earlier decision in Will County Grand Jury, this
    court stated that article I, section 6, forbids unreasonable
    invasions of privacy and that, A[i]n the context of civil discovery,
    reasonableness is a function of relevance.@ 
    Kunkel, 179 Ill. 2d at 538
    . Amended section 2B1003(a) was held unconstitutional
    because it permitted Adisclosure of highly personal medical
    information having no bearing on the issues in the lawsuit@ and,
    as such, permitted Aa substantial and unjustified invasion of
    privacy.@ 
    Kunkel, 179 Ill. 2d at 539
    . See also Best v. Taylor
    Machine Works, 
    179 Ill. 2d 367
    (1997) (declaring the Civil
    Justice Reform Amendments of 1995 unconstitutional in toto;
    noting that the right to be free from unreasonable governmental
    -37-
    intrusions upon privacy of article I, section 6, is supplemented
    by the constitutional right to a certain remedy for invasions of
    privacy in article I, section 12, of the Illinois Constitution of
    1970).
    Several years thereafter, the plaintiff in a medical
    malpractice action challenged the constitutionality of portions of
    the Hospital Licensing Act (210 ILCS 85/1 et seq. (West 2000))
    on separation of powers, privacy, and special legislation
    grounds. Burger v. Lutheran General Hospital, 
    198 Ill. 2d 21
    (2001). The challenged provisions permit medical staff
    members to communicate with a hospital=s legal staff regarding
    the care of a patient who files a malpractice action, even if the
    staff member is not a party to the action. In addition, the statute
    provides that hospital medical personnel who act in good faith
    in providing information about a patient=s care to hospital legal
    staff are protected from civil or criminal liability. 210 ILCS
    85/6.17(d), (e) (West 2000). We rejected the plaintiff=s
    contention that these provisions violate the patient=s right to
    privacy under article I, sections 6 and 12, and under this court=s
    decisions in Kunkel and Best. Although the privacy clause is
    most certainly implicated by these provisions in the Hospital
    Licensing Act, only unreasonable invasions of privacy are
    constitutionally forbidden. 
    Burger, 198 Ill. 2d at 52
    . We
    concluded that the Alimited intrahospital communications
    allowed pursuant to subsections (d) and (e) in order to assure
    quality patient care do not unreasonably invade a hospital
    patient=s expectation of privacy.@
    This court first addressed a privacy claim based on article I,
    section 6, in the context of a criminal prosecution in People v.
    Cornelius, 
    213 Ill. 2d 178
    (2004). The defendant, who was
    charged with failure to register as a sex offender, challenged
    the constitutionality of the Sex Offender Registration Act (730
    ILCS 150/1 et seq. (West 2002)), and the Sex Offender and
    Child Murderer Community Notification Law (730 ILCS 152/101
    et seq. (West 2002)) on privacy, due process, equal protection,
    and ex post facto grounds. Relying on the privacy clause of
    article I, section 6, of the Illinois Constitution of 1970, he
    argued that while the registration requirement itself did not
    violate his right to privacy, the Awholesale dissemination@ of his
    photograph and other information via the Internet was
    unreasonable. 
    Cornelius, 213 Ill. 2d at 192
    . Such claims
    -38-
    require a twofold inquiry. First, the court must determine
    whether the party challenging a statute on privacy grounds has
    a reasonable expectation of privacy in the information he seeks
    to protect and, second, we must determine whether the statute
    unreasonably invades that expectation of privacy. 
    Cornelius, 213 Ill. 2d at 193-94
    . We concluded that the defendant=s claim
    failed the first part of the twofold inquiry. The defendant did not
    have a cognizable privacy interest in information that was
    already a matter of public record in the pre-Internet version of
    the sex offender registry. Although accessibility via the Internet
    may have made the information more widely available to the
    public, the information was not private and, therefore, did not
    come within the scope of the protection provided by the privacy
    clause of the Illinois Constitution. 
    Cornelius, 213 Ill. 2d at 197
    ,
    quoting People v. Logan, 
    302 Ill. App. 3d 319
    , 334 (1998).
    Further, unlike the uncharged targets of the grand jury
    investigation in Will County Grand Jury, the defendant had
    been convicted of aggravated criminal sexual abuse. The
    conduct that resulted in his conviction Alowered the privacy bar
    and culminated in a public record that contains the challenged
    information.@ 
    Cornelius, 213 Ill. 2d at 198
    .
    This line of cases employs a two-part framework for the
    consideration of a claim that a state statute or other state
    action violates the privacy clause of article I, section 6, of the
    Illinois Constitution of 1970. Cases in which the privacy clause
    has been found to apply have involved either private records or
    documents or information of the type typically contained therein
    or an invasion of the actual physical body of the person. None
    of these cases have involved a claim that an individual=s
    constitutionally protected zone of privacy was violated by an
    investigative technique employed by the police that did not
    involve the taking of physical evidence from the body of the
    individual. Further, none of these cases involved police conduct
    during a routine traffic stop or other routine encounter with a
    member of the public.
    Two cases involving just such claims are Mitchell, 
    165 Ill. 2d
    211, and Bolden, 
    97 Ill. 2d 166
    . In Mitchell, 
    165 Ill. 2d
    at
    216, this court applied the Supreme Court=s decision in
    Minnesota v. Dickerson, 
    508 U.S. 366
    , 
    124 L. Ed. 2d 334
    , 
    113 S. Ct. 2130
    (1993) (holding that the Aplain feel@ doctrine does
    not offend the fourth amendment), to conclude that the Aplain
    -39-
    touch@ doctrine comports with the search and seizure clause of
    article I, section 6, of the state constitution. We then turned to
    defendant=s argument that a pat-down search falls within the
    scope of the right to privacy clause of article I, section 6, rather
    than within the scope of the search and seizure clause,
    because it involves a police officer laying hands on the body of
    a person. Mitchell, 
    165 Ill. 2d
    at 219. We recognized a certain
    Acommonality of purpose@ shared by the three clauses of article
    I, section 6, but noted that A[n]otwithstanding that commonality,
    each clause differs with respect to the conduct it was designed
    to prohibit.@ Mitchell, 
    165 Ill. 2d
    at 220. Further, although the
    touching of a person=s body during a Terry stop and search
    Atriggers right-to-privacy concerns generally, such conduct is
    more particularly a search and seizure issue.@ Mitchell, 
    165 Ill. 2d
    at 220. After examining the history of the privacy clause, we
    concluded that Athe drafters intended no change in the
    categorization of conduct traditionally covered by the search
    and seizure clause.@ Mitchell, 
    165 Ill. 2d
    at 221. We held that
    the conduct at issue, a pat-down search by the police,
    Acontinues to fall within the bounds of the search and seizure
    clause,@ and we declined to extend the reasoning of Will
    County Grand Jury to reach it.
    In Bolden, the defendant voluntarily appeared at the police
    station and participated in a lineup. He was identified by the
    witness and the lineup identification was admitted at trial, over
    defendant=s objection that his constitutional rights were violated
    by the detectives= refusal to allow defense counsel to be
    present with the witness during the lineup. We rejected the
    defendant=s fifth and sixth amendment claims (Bolden, 
    197 Ill. 2d
    at 175-77), and turned to his argument that refusal to allow
    his lawyer to observe the witness during the lineup converted
    his voluntary appearance into an involuntary seizure in violation
    of the fourth amendment (Bolden, 
    197 Ill. 2d
    at 177-78). He
    also argued that, even if he had not been seized for fourth
    amendment purposes, the police conduct nevertheless violated
    both the search and seizure clause and the privacy clause of
    article I, section 6, of the Illinois Constitution of 1970. We
    observed that the defendant had failed to distinguish between
    the two clauses and noted that A[w]hile the privacy clause of
    article I, section 6, possesses a unique constitutional history, it
    is of no assistance here to the defendant, for it is a separate
    -40-
    guarantee and does not serve to transform the nearby search
    and seizure clause into a source of state constitutional rights
    that are more extensive than those conferred by the fourth
    amendment.@ Bolden, 
    197 Ill. 2d
    at 179. Finally, we determined
    that the defendant had not been seized because his freedom to
    leave the police station was unrestricted until the lineup was
    concluded and he was placed under arrest. Bolden, 
    197 Ill. 2d
    at 181-82.
    Reading these two groups of cases in conjunction, it is
    evident that the privacy clause of article I, section 6, may be
    implicated in the context of a criminal investigation. Whether
    physical evidence obtained from the body of the defendant is
    sought by a grand jury or obtained by the police during an
    investigation, the state=s intrusion into the individual=s bodily
    zone of privacy must be reasonable. With regard to
    noninvasive physical evidence, such as fingerprints, voice
    exemplars, and handwriting samples, a showing of relevance
    and of individualized suspicion must be made. People v.
    Watson, 
    214 Ill. 2d 271
    , 283 (2005), quoting Will County Grand
    
    Jury, 152 Ill. 2d at 393
    . When the state seeks physical
    evidence of a more intrusive nature, such as head, facial, or
    pubic hair, Awhere the compelled production would constitute a
    search or seizure under the fourth amendment,@ probable
    cause is required. 
    Watson, 214 Ill. 2d at 283
    .
    The privacy clause is also implicated if, in the course of a
    criminal investigation, the state seeks access to medical or
    financial records that are within the scope of the protections of
    article I, section 6. See, e.g., Will County Grand Jury, 
    152 Ill. 2d
    at 396, citing with approval, People v. Jackson, 
    116 Ill. App. 3d
    430, 434-35 (1983) (article I, section 6, assures citizens of a
    right of privacy in their bank records).      In the present case,
    we are asked to determine whether having an officer circle a
    vehicle in the company of a trained narcotics-detection dog,
    while the dog sniffs the air in an effort to detect the presence of
    contraband, invades the zone of privacy established by article
    I, section 6. Defendant would have us treat the dog sniff as
    more like the taking of a physical specimen for analysis (as in
    Will County Grand Jury) than the performance of a routine pat-
    down (as in Mitchell) because it involves the government=s use
    of a Adevice@ that enhances ordinary human sensory
    perceptions.
    -41-
    The State responds that the dog sniff took place in the
    course of a routine traffic stop and is properly analyzed under
    traditional search and seizure principles, without any need to
    consider the privacy clause.
    A dog sniff of an individual or of his vehicle or luggage does
    not reveal private medical information (i.e., the presence
    prescription medications for the treatment of psychiatric
    disorders or sexually transmitted diseases), so it does not
    implicate the concerns at issue in Kunkel. A dog sniff will not
    reveal the contents of diaries or love letters; it will not reveal
    the individual=s choice of reading materials, whether religious,
    political, or pornographic; it will not reveal sexual orientation or
    marital infidelity. Thus, it does not infringe on the zone of
    personal privacy that the drafters intended to protect. Properly
    conducted, a dog sniff will not result in the slightest touching of
    the individual, so the privacy concerns at issue in Will County
    Grand Jury, King, and Fink, are not implicated.
    Indeed, once the dog sniff has been conducted, no search
    will ensue unless the dog alerts to the scent of illegal narcotics.
    Thus, the image suggested by amicus ACLU of the police
    searching an individual=s luggage by the side of the road and
    exposing private matters to public view will not occur unless a
    dog sniff has revealed the presence of illegal narcotics. A
    person who chooses to transport contraband in his vehicle,
    knowing that its presence may be detected by a canine unit if
    he commits a traffic violation, has taken the risk of exposure
    during the ensuing search of whatever private materials he
    may have with him in the vehicle.
    We conclude that the dog sniff of a vehicle does not
    constitute an invasion of privacy. It is, in fact, even less
    invasive or intrusive than the routine pat-down which, after all,
    involves the officer=s physical contact with the clothing of the
    individual. Thus, the present case falls within the line of cases
    represented by Mitchell and Bolden and must be analyzed
    solely as a search and seizure issue. Given our limited
    lockstep approach to search and seizure analysis, the answer
    is clear. The sniff did not violate defendant=s right to be free
    from unreasonable search and seizure. See 
    Caballes, 543 U.S. at 409
    , 160 L. Ed. 2d at 
    847, 125 S. Ct. at 838
    (Athe use of a
    -42-
    well-trained narcotics-detection dogBone that >does not expose
    noncontraband items that otherwise would remain hidden from
    public view=Bduring a lawful traffic stop, generally does not
    implicate legitimate privacy interests@ cognizable under the
    fourth amendment), quoting United States v. Place, 
    462 U.S. 696
    , 707, 
    77 L. Ed. 2d 110
    , 121, 
    103 S. Ct. 2637
    , 2644 (1983).
    Reliability of the ADevice@ Employed in a Dog Sniff
    The Supreme Court has Atreated a canine sniff by a well-
    trained narcotics-detection dog as >sui generis= because it
    >discloses only the presence or absence of narcotics, a
    contraband item.= @ 
    Caballes, 543 U.S. at 409
    , 160 L. Ed. 2d at
    
    847, 125 S. Ct. at 838
    , quoting 
    Place, 462 U.S. at 707
    , 77 L.
    Ed. 2d at 
    121, 103 S. Ct. at 2644
    . Such use of narcotics-
    detection dogs by the police has been described as a Abinary
    search@ or a Acontent-discriminating@ search, because it yields
    only a yes-or-no answer, not an inventory of the contents of the
    vehicle or container being searched. See R. Simmons, From
    Katz to Kyllo: A Blueprint for Adapting the Fourth Amendment
    to Twenty-First Century Technologies, 53 Hastings L.J. 1303,
    1348 (2002). In contrast, a technology or procedure that not
    only discloses criminal activity, but also lawful activity, is not
    content-discriminating. Use of such technology constitutes a
    search and, therefore, must pass muster under the fourth
    amendment. Thus, in 
    Kyllo, 533 U.S. at 34-35
    , 150 L. Ed. 2d at
    
    102, 121 S. Ct. at 2043
    , the Court held that the use of a
    thermal-imaging device to detect the presence of marijuana
    plants inside a home constituted an unlawful search. Because
    the device also revealed intimate details of conduct inside the
    home, such as Aat what hour each night the lady of the house
    takes her daily sauna and bath,@ use of the device violated the
    occupants= legitimate expectation of privacy. 
    Kyllo, 533 U.S. at 38
    , 150 L. Ed. 2d at 
    105, 121 S. Ct. at 2045
    .
    Defendant argues that even if this court reaffirms its
    commitment to a lockstep approach and concludes that the
    privacy clause of article I, section 6, does not forbid the use of
    canine sniffs during routine traffic stops, this court should
    address (1) the reliability of the Adevice@ used in this binary
    search, and (2) if it finds the device reliable, consider whether
    -43-
    the duration, degree, and nature of the intrusion in this case,
    coupled with all other conduct of the officers, constituted an
    illegal Aseizure.@ The State responds that there is no basis for
    overturning the trial court=s factual finding that the dog, Krott,
    was sufficiently reliable to provide the officers with probable
    cause to search the trunk of defendant=s car.
    One scholar has noted that A[i]n an ideal world, law
    enforcement officials would design devices that (1) only
    produced a binary response when used and conveyed no other
    information about the person or area searched; (2) were 100%
    accurate; and (3) that only responded when the individual
    possessed an itemBnarcotics, firearms, child pornography,
    etc.Bthat was clearly illegal.@ 53 Hastings L.J. at 1354. Without
    adopting these criteria, we consider their application to a dog
    sniff.
    Clearly, the first of these criteria is met. The dog either
    alerts to the scent of illegal narcotics, or he does not. Even if
    the dog is capable of detecting the presence of other
    substances, he is not capable of communicating such
    information to the officer.
    With regard to the third criterion suggested by Professor
    Simmons, defendant argues that a high percentage of
    circulating paper currency has been contaminated by drugs
    and that this circumstance leads to false positive results. If a
    narcotics-detection dog alerts to the mere presence of
    contaminated currency, a search will follow and private
    information about the individual may be exposed. The record,
    however, contains no evidence that supports either his general
    argumentBthat the rate of false positive results is
    unacceptableBor the specific argument that he was affected by
    a false positive result. Indeed, after hearing testimony
    regarding the particular dog involved in this case, the trial judge
    found that the dog sniff was sufficiently reliable to establish
    probable cause for the search of the trunk of defendant=s car.
    This factual finding is not against the manifest weight of the
    evidence.
    Turning to the second of Professor Simmons= criteria,
    defendant argues that the accuracy requirement cannot be
    met. Again, he points to the possibility of a false positive alert
    -44-
    and suggests that this court should be Asuspicious@ of all dog
    sniffs for this reason. Relying on an as-yet unpublished law
    review article that defendant did not append to his brief, he
    proposes that in each case where the prosecutor would rely on
    a binary search such as a dog sniff, the trial court should
    engage in a full evaluation of the method or technique. He
    analogizes this to a Daubert 1 hearing, Abut with the State Aheld
    to a much higher standard@Ba standard Ahigh enough to ensure
    that the binary search doctrine=s inevitable widespread
    indiscriminate application does not result in overwhelming
    numbers of unjustified searches of innocent subjects.@ He asks
    that this matter be remanded to the trial court for an evidentiary
    hearing on the accuracy of the dog-sniff technique.
    Defendant=s concerns about Awidespread@ abuse of the use
    of police canine units and Aoverwhelming numbers@ of innocent
    subjects are pure speculation. The Supreme Court has not
    established such criteria, saying only that a canine sniff is
    permissible when the dog is Awell-trained.@ 
    Caballes, 543 U.S. at 409
    , 160 L. Ed. 2d at 
    847, 125 S. Ct. at 838
    , quoting 
    Place, 462 U.S. at 707
    , 77 L. Ed. 2d at 
    121, 103 S. Ct. at 2644
    . On
    the record before us, we find no basis for concluding that the
    trial court=s finding of reliability was manifestly erroneous.
    Defendant also argues that by holding that a so-called
    binary search is not a search for fourth amendment purposes,
    the Supreme Court has merely legitimated a search based on
    an ex post facto examination of what the police actually find
    after the dog alerts and a full-blown search is conducted. He
    contends that by following this ruling in lockstep, this court is
    committing the same alleged error. As the professor upon
    1
    Defendant refers to the standard established by the United States
    Supreme Court for the admission of scientific evidence in Daubert v.
    Merrell Dow Pharmaceuticals, Inc., 
    509 U.S. 579
    , 
    125 L. Ed. 2d 469
    , 
    113 S. Ct. 2786
    (1993). In Illinois, however, the admission of expert testimony
    regarding scientific evidence is governed by the standard of Frye v. United
    States, 
    293 F. 1013
    (D.C. Cir. 1923). See Donaldson v. Central Illinois
    Public Service Co., 
    199 Ill. 2d 63
    , 80 n.1 (2002) (noting that this court has
    not considered adopting the new Daubert standard to replace the Frye
    standard).
    -45-
    whom defendant so greatly relies has noted, however, A[t]his
    objection misses the point entirely; a binary search is not
    constitutional because of what it does find, but because of what
    it is capable of finding.@ (Emphases omitted.) 53 Hastings L.J.
    at 1354, n.214.
    Finally, we decline to address defendant=s last
    argumentBthat he was illegally seized even if he was not
    illegally searchedBbecause he devotes only two sentences to
    this topic. The only authority he cites for this proposition is this
    court=s now-vacated opinion in Caballes I.
    CONCLUSION
    Having given due consideration to the arguments of the
    parties and having reviewed, in detail, the history, purpose, and
    rationale of the lockstep doctrine as it has been applied in
    Illinois, we reaffirm our adherence to a limited lockstep
    approach to the interpretation of a provision of the Illinois
    Constitution of 1970 that is identical to or entirely synonymous
    with a provision of the United States Constitution. We further
    hold that a dog sniff of a vehicle during a routine traffic stop
    does not implicate the privacy clause of article I, section 6, of
    the Illinois Constitution of 1970. Finally, we hold that the
    evidence obtained as a result of the dog sniff was properly
    admitted in defendant=s trial.
    The judgment of the appellate court, which affirmed the
    circuit court=s judgment, is affirmed.
    Appellate court judgment affirmed.
    JUSTICE FREEMAN, dissenting:
    Today=s opinion puts to rest the confusion that has
    animated our application of the Alockstep doctrine.@ As the
    court explains, various methods for construing provisions of
    individual state constitutions have been adopted by state
    courts. One such method, the lockstep doctrine, has been
    defined as follows:
    -46-
    A >Under the lockstep approach, the state
    constitutional analysis begins and ends with
    consideration of the U.S. Supreme Court=s interpretation
    of the textual provision at issue. On this approach,
    federal rulings are regarded as having attained >a
    presumption of correctness= from which the state should
    be loathe to part. In other words, congruence with
    federal decisional law is assumed to be the norm, and
    deviation is for all intents and purposes impossible.= @
    Slip op. at 20, quoting L. Friedman, The Constitutional
    Value of Dialogue and the New Judicial Federalism, 28
    Hastings Const. L.Q. 93, 102-03 (2000).
    In light of the numerous times this court has deviated from
    federal decisional law (see, e.g., People v. Krueger, 
    175 Ill. 2d 60
    (1996); People v. Washington, 
    171 Ill. 2d 475
    (1996)), it is
    clear that this court has not truly followed in Alockstep@ with the
    United States Supreme Court. I therefore agree with the court
    when it states that Ait is an overstatement to describe our
    approach as being in strict lockstep with the Supreme Court.@
    Slip op. at 21-22. Like my colleagues in the majority, I believe
    that the method this court has been applying throughout the
    years has been a form of the Ainterstitial approach.@ As the
    court explains, under this approach, the court first looks to
    whether the right being asserted is protected under the federal
    constitution. If it is, then the state constitutional claim is not
    reached. If it is not, then the state constitution is examined. Slip
    op. at 21, quoting State v. Gomez, 
    122 N.M. 777
    , 783, 
    932 P.2d 1
    , 7 (1997). This approach Aacknowledges the United
    States Constitution as the basic protector of fundamental
    liberties and treats the federal declaration as the lowest
    common denominator in protecting those liberties.@ S. Pollock,
    State Constitutions as Separate Sources of Fundamental
    Rights, 35 Rutgers L. Rev. 707, 718 (1983).
    A review of the instances in which this court has departed
    from federal law reveals that this court has done so for reasons
    that are commonly associated with this approach. A state court
    utilizing the interstitial approach Amay diverge from federal
    precedent for three reasons: a flawed federal analysis,
    structural differences between state and federal government,
    -47-
    or distinctive state characteristics.@ Gomez, 122 N.M. at 
    783, 932 P.2d at 7
    . In Krueger, the court implied strongly that it was
    departing from federal law because it believed the United
    States Supreme Court=s analysis to be flawed. Krueger, 
    175 Ill. 2d
    at 72-73. In Washington, the court implied that it was
    necessary to recognize a constitutional basis in state habeas
    corpus jurisprudence for addressing actual innocence claims
    because federal law did not provide a forum for such a
    claimBthis, of course, implicates the differences between the
    state and federal systems. 
    Washington, 171 Ill. 2d at 489
    .
    Notwithstanding my agreement with the court=s conclusion
    that we are not a truly Alockstep@ court, I believe this case to be
    one which necessitates our divergence from federal precedent.
    In my view, Justice Ginsburg=s dissent reveals several serious
    flaws in the Court=s decision. She points out that the Court=s
    decision Adiminishes the Fourth Amendment=s force@ by
    abandoning the critical step of the Terry analysis. Illinois v.
    Caballes, 
    543 U.S. 405
    , 421, 
    160 L. Ed. 2d 842
    , 855, 125 S.
    Ct. 834, 845 (2005) (Ginsburg, J., dissenting, joined by Souter,
    J.). Justice Ginsburg also criticizes the fact that the decision
    Aundermines@ the Court=s Asituation-sensitive balancing of
    Fourth Amendment interests in other contexts.@ 
    Caballes, 543 U.S. at 423
    , 160 L. Ed. 2d at 
    856, 125 S. Ct. at 846
    . These
    criticisms are apt and compel me to the conclusion that
    divergence from the Supreme Court is necessary under the
    circumstances presented at bar.
    I therefore would hold that the police action in this case
    violated defendant=s right against unreasonable searches
    under article I, section 6, of the Illinois Constitution when,
    without cause to suspect wrongdoing, they conducted a dog
    sniff of his vehicle. In light of my position, I need not reach, nor
    do I express any view on, the question of whether the
    unreasonable invasion of privacy clause in the same section of
    our constitution is implicated in this case.
    JUSTICES McMORROW and KILBRIDE join in this dissent.
    -48-