Commonwealth v. Ehiabhi ( 2017 )


Menu:
  • NOTICE: All slip opinions and orders are subject to formal
    revision and are superseded by the advance sheets and bound
    volumes of the Official Reports. If you find a typographical
    error or other formal error, please notify the Reporter of
    Decisions, Supreme Judicial Court, John Adams Courthouse, 1
    Pemberton Square, Suite 2500, Boston, MA, 02108-1750; (617) 557-
    1030; SJCReporter@sjc.state.ma.us
    SJC-12259
    COMMONWEALTH   vs.   MOSES EHIABHI.
    Suffolk.     May 4, 2017. - October 13, 2017.
    Present:    Gants, C.J., Lenk, Hines, Gaziano, Lowy, Budd,
    & Cypher, JJ.1
    Controlled Substances. Assault and Battery on Certain Public
    Officers and Employees. Constitutional Law, Sentence,
    Separation of powers, Search and seizure. Practice,
    Criminal, Sentence, Motion to suppress, Instructions to
    jury. Search and Seizure, Motor vehicle, Impoundment of
    vehicle, Inventory.
    Indictments found and returned in the Superior Court
    Department on January 13, 2014.
    A pretrial motion to suppress evidence was heard by Mary K.
    Ames, J.; the cases were tried before Elizabeth M. Fahey, J.,
    and the correctness of the sentence was reported by her to the
    Appeals Court.
    The Supreme Judicial Court on its own initiative
    transferred the case from the Appeals Court.
    Zachary Hillman, Assistant District Attorney, for the
    Commonwealth.
    Sarah E. Dolven for the defendant.
    1
    Justice Hines participated in the deliberation on this
    case prior to her retirement.
    2
    Patrick Levin, Committee for Public Counsel Services, &
    Chauncy B. Wood, for Committee for Public Counsel Services &
    another, amici curiae, submitted a brief.
    CYPHER, J.    This case examines a sentencing scheme that
    punishes the same conduct with different mandatory minimum
    sentences.    See G. L. c. 94C, § 32A (b), (d).   Both subsections
    punish possession with intent to distribute a class B substance,
    but § 32A (b) carries a mandatory minimum sentence of two years
    while § 32A (d) carries a mandatory minimum sentence of three
    and one-half years.     In the law's current form, § 32A (a)
    punishes first-time distribution of any of forty class B
    substances, including phencyclidine (PCP), cocaine, and
    methamphetamine; § 32A (b) punishes subsequent distribution of a
    class B substance; § 32A (c) punishes first-time distribution of
    PCP, cocaine, or methamphetamine; and § 32A (d) punishes
    subsequent distribution of PCP, cocaine, or methamphetamine.
    G. L. c. 94C, § 32A.2    The defendant, Moses Ehiabhi, was charged
    2
    In relevant part, G. L. c. 94C, § 32A, provides:
    "(a) Any person who knowingly or intentionally
    manufactures, distributes, dispenses, or possesses with
    intent to manufacture, distribute or dispense a controlled
    substance in Class B of [§ 31] shall be punished by
    imprisonment in the [S]tate prison for not more than ten
    years, or in a jail or house of correction for not more
    than two and one-half years, or by a fine of not less than
    [$1,000] nor more than [$10,000], or both such fine and
    imprisonment.
    "(b) Any person convicted of violating this section
    3
    after one or more prior convictions of manufacturing,
    distributing, dispensing, or possessing with the intent to
    manufacture, distribute or dispense a controlled substance
    as defined by [§ 31] of this chapter under this or any
    other prior law of this jurisdiction or of any offense of
    any other jurisdiction, [F]ederal, [S]tate, or territorial,
    which is the same as or necessarily includes the elements
    of said offense shall be punished by a term of imprisonment
    in the [S]tate prison for not less than [two] nor more than
    ten years. No sentence imposed under the provisions of
    this section shall be for less than a mandatory minimum
    term of imprisonment of [two] years and a fine of not less
    than [$2,500] nor more than [$25,000] may be imposed but
    not in lieu of the mandatory minimum term of imprisonment,
    as established herein.
    "(c) Any person who knowingly or intentionally
    manufactures, distributes, dispenses or possesses with
    intent to manufacture, distribute or dispense phencyclidine
    or a controlled substance defined in clause (4) of
    paragraph (a) or in clause (2) of paragraph (c) of class B
    of § 31 shall be punished by a term of imprisonment in the
    [S]tate prison for not less than two and one-half nor more
    than ten years or by imprisonment in a jail or house of
    correction for not less than one nor more than two and one-
    half years. No sentence imposed under the provisions of
    this section shall be for less than a mandatory minimum
    term of imprisonment of one year and a fine of not less
    than [$1,000] nor more than [$10,000] may be imposed but
    not in lieu of the mandatory minimum one year term of
    imprisonment, as established herein.
    "(d) Any person convicted of violating the provisions
    of subsection (c) after one or more prior convictions of
    manufacturing, distributing, dispensing or possessing with
    the intent to manufacture, distribute, or dispense a
    controlled substance, as defined in [§ 31] or of any
    offense of any other jurisdiction, either [F]ederal,
    [S]tate or territorial, which is the same as or necessarily
    includes, the elements of said offense, shall be punished
    by a term of imprisonment in the [S]tate prison for not
    less than [three and one-half] nor more than fifteen years
    and a fine of not less than [$2,500] nor more than
    [$25,000] may be imposed but not in lieu of the mandatory
    minimum term of imprisonment, as established herein."
    4
    and convicted of possession with intent to distribute cocaine,
    second offense, under § 32A (c) and (d), but the judge, over the
    objection of the Commonwealth, sentenced pursuant to § 32A (a)
    and (b).3
    Pursuant to G. L. c. 231, § 111,4 and Mass. R. Crim. P. 34,
    as amended, 
    442 Mass. 1501
    (2004),5 the trial judge reported the
    Section 31 defines cocaine as "[c]oca leaves and any salt,
    compound, derivative, or preparation of coca leaves, and any
    salt, compound, derivative, or preparation thereof which is
    chemically equivalent or identical with any of these substances,
    except that the substances shall not include decocainized coca
    leaves or extraction of coca leaves, which extractions do not
    contain cocaine or ecgonine." G. L. c. 94C, § 31 Class B (a)
    (4).
    3
    The defendant faced three additional charges: resisting
    arrest, in violation of G. L. c. 268, § 32B; operating a motor
    vehicle while under the influence of a controlled substance, in
    violation of G. L. c. 90, § 24 (1) (a) (1); and assault and
    battery on a police officer, in violation of G. L. c. 265,
    § 13D. The defendant prevailed in his motion for a required
    finding of not guilty as to the charge of resisting arrest; was
    acquitted of the operating while under the influence of
    marijuana charge; and was convicted of assault and battery on a
    police officer.
    4
    General Laws c. 231, § 111, provides in relevant part: "A
    justice of the [Superior Court] . . . , after verdict or after a
    finding of the facts by the court, may report the case for
    determination by the [A]ppeals [C]ourt."
    5
    In relevant part, Mass. R. Crim. P. 34, as amended, 
    442 Mass. 1501
    (2004), provides:
    "If, prior to trial, or, with the consent of the
    defendant, after conviction of the defendant, a question of
    law arises which the trial judge determines is so important
    or doubtful as to require the decision of the Appeals
    Court, the judge may report the case so far as necessary to
    present the question of law arising therein."
    5
    correctness of her sentencing decision to the Appeals Court, and
    allowed the defendant's motion to stay the sentence pending his
    appeal.   The Commonwealth appeals from both the sentence and the
    stay of sentence.   The defendant also appeals, claiming error in
    the denials of his motion to suppress evidence and his motion
    for a required finding of not guilty on the assault and battery
    charge, and in the jury instruction on self-defense as to that
    charge.   The Appeals Court consolidated the appeals, and we
    transferred the case to this court on our own motion.   For the
    reasons detailed below, we affirm the convictions and remand to
    the Superior Court for resentencing.6
    1.   The reported question and the Commonwealth's appeal.
    After the Commonwealth moved for sentencing, the judge asked why
    the Commonwealth had proceeded under the section of the statute
    that provided a harsher minimum mandatory sentence where the
    elements of both sections were identical.   The prosecutor
    explained that her office "typically" indicted cocaine charges
    under the enhanced section because cocaine is "considered a more
    dangerous substance than other items under [c]lass B, such as
    pills."   The prosecutor also justified her pursuit of harsher
    penalties in this case by the fact that the defendant was on
    Federal supervised release for the same crime when he committed
    6
    We acknowledge the amicus brief of the Committee for
    Public Counsel Services and the Massachusetts Association of
    Criminal Defense Lawyers.
    6
    the new offense.
    The judge rejected both arguments, concluding that
    ambiguity existed in the conflicting mandatory minimum sentences
    of two years for a repeat distributor of cocaine under § 32A (b)
    and three and one-half years for a repeat distributor of cocaine
    under § 32A (d).   The judge read this conflict to require
    application of the rule of lenity in favor of the less stringent
    sentence, citing Commonwealth v. Gagnon, 
    387 Mass. 567
    , 569,
    S.C., 
    387 Mass. 768
    (1982), cert. denied, 
    464 U.S. 815
    (1983);
    United States v. Shaw, 
    920 F.2d 1225
    , 1228 (5th Cir.), cert
    denied, 
    500 U.S. 926
    (1991).
    The Commonwealth argues that the trial judge erred in
    sentencing the defendant pursuant to G. L. c. 94C, § 32A (b),
    where he had been charged and convicted pursuant to § 32A (d),
    and where the prosecutor retains the discretion to charge under
    either subsection.    The defendant contends that the judge
    properly applied the rule of lenity where the statute is
    ambiguous in its provision of inconsistent penalties for the
    identical offense.    We agree with the Commonwealth that the
    statute is unambiguous, and preserves the prosecutor's
    discretion to choose among its subsections.
    a.   Ambiguity.    The levels of punishment upon conviction of
    possession with intent to distribute a controlled substance are
    determined with reference to which of the five classes of
    7
    controlled substances the particular controlled substance
    belongs.   G. L. c. 94C, § 31.   "Such disparate sentences embody
    the legislative judgment differentiating certain classes of
    controlled substances as more detrimental to the mind or the
    body than others."   Commonwealth v. Chavis, 
    415 Mass. 703
    , 709
    n.9 (1993).
    Cocaine is listed as a class B controlled substance, with
    penalties provided at G. L. c. 94C, § 32A.    Section 32A was
    inserted into the General Laws by St. 1980, c. 436, "as part of
    a major revision of the Controlled Substances Act."
    Commonwealth v. Neiman, 
    396 Mass. 754
    , 758 (1986).    As
    originally enacted, § 32A had two paragraphs.   Paragraph (a)
    provided a penalty of from one to ten years for first-time
    distribution of a class B substance, without requiring a
    mandatory minimum sentence, and paragraph (b) provided a
    mandatory minimum of three years for subsequent offenses,
    St. 1980, c. 436, § 4, later reduced to two years.    St. 2012,
    c. 192, § 13.
    In the years following the enactment of § 32A, the
    Legislature singled out three drugs for harsher punishment than
    other class B substances:   PCP in 1981, St. 1981, c. 522 (adding
    paragraph [c] to impose one-year mandatory minimum sentence for
    distribution of PCP); cocaine in 1988, St. 1988, c. 125, § 1
    (amending paragraph [c] to impose same penalty for distribution
    8
    of cocaine); and methamphetamine in 1991, St. 1991, c. 391
    (same, for distribution of methamphetamine).     See Commonwealth
    v. Bradley, 
    35 Mass. App. Ct. 525
    , 526 n.1 (1993) (discussing
    statutory history of § 32A).   When the Legislature added cocaine
    to paragraph (c), it also inserted paragraph (d), which provided
    a five-year minimum sentence for subsequent offenders "convicted
    of violating the provisions of subsection (c)," St. 1988, c.
    125, §§ 1-2; that minimum was later reduced to three and one-
    half years.   St. 2012, c. 192, § 14.    The language of paragraph
    (b) remained unaltered, and continues to apply to "[a]ny person
    convicted of violating this section."    See Bradley, supra (§ 32A
    [b] was "[a] repeat offender provision that applied to all
    offenses outlined in the statute").     Cocaine, as well as PCP and
    methamphetamine, remain among the forty enumerated class B
    substances.   G. L. c. 94C, § 31 Class B 2 (a) (4).
    The statutory scheme, when read as a whole and in the
    context of its history, is not ambiguous, and therefore the rule
    of lenity is not applicable.   "It is a fundamental tenet of due
    process that '[n]o one may be required at peril of life, liberty
    or property to speculate as to the meaning of penal statutes.'"
    
    Gagnon, 387 Mass. at 569
    , quoting United States v. Batchelder,
    
    442 U.S. 114
    , 123 (1979).   "Under the rule of lenity, 'if we
    find that the statute is ambiguous or are unable to ascertain
    the intent of the Legislature, the defendant is entitled to the
    9
    benefit of any rational doubt.' . . .    'This principle applies
    to sentencing as well as substantive provisions.'"     (Citations
    omitted).    Commonwealth v. Richardson, 
    469 Mass. 248
    , 254
    (2014).
    We have previously rejected the argument that § 32A is
    unconstitutionally void for vagueness, reasoning that "[w]e
    simply see no significant ambiguity in the legislative intent
    expressed in § 32A (a) and § 32A (c)."    Cedeno v. Commonwealth,
    
    404 Mass. 190
    , 194 (1989).   We reaffirm the view that "[i]f
    there is a problem in a constitutional sense in the coexistence
    of § 32A (a) and § 32A (c), it does not lie in any uncertainty
    about what those sections mean."    
    Id. at 196.
      For similar
    reasons, the United States Supreme Court upheld two firearm
    statutes that punished the same conduct with different
    sentences.   
    Batchelder, 442 U.S. at 116
    , 123 ("The provisions in
    issue . . . unambiguously specify the activity proscribed and
    the penalties available upon conviction. . . .     That this
    particular conduct may violate both [t]itles [of the United
    States Code] does not detract from the notice afforded by each.
    Although the statutes create uncertainty as to which crime may
    be charged and therefore what penalties may be imposed, they do
    so to no greater extent than would a single statute authorizing
    various alternative punishments" [citation omitted]).     Where the
    statute is unambiguous, the rule of lenity is inapposite.       See
    10
    
    Richardson, 469 Mass. at 254
    .
    b.    Prosecutorial discretion.    Because we find the rule of
    lenity inoperative here, we proceed to the separation of powers
    challenge.   Verrochi v. Commonwealth, 
    394 Mass. 633
    , 638 (1985)
    (construing statute to avoid constitutional difficulties).
    Article 30 of the Massachusetts Declaration of Rights forbids
    the legislative and executive branches from exercising powers
    entrusted to the judicial branch if that exercise "restrict[s]
    or abolish[es] a court's inherent powers."      Commonwealth v.
    Cole, 
    468 Mass. 294
    , 301 (2014).7      Although "[a]n absolute
    division of the [executive, legislative, and judicial] functions
    is neither possible nor always desirable," Opinion of the
    Justices, 
    365 Mass. 639
    , 641 (1974), a statute impermissibly
    allocating a power held by only one branch to another violates
    art. 30.   Cole, supra at 302.
    Within these constitutional confines, prosecutors enjoy
    considerable discretion.    See Commonwealth v. Rivas, 
    466 Mass. 184
    , 188 n.4 (2013), quoting Commonwealth v. Johnson, 
    75 Mass. 7
           Article 30 of the Massachusetts Declaration of Rights
    provides:
    "In the government of this commonwealth, the
    legislative department shall never exercise the executive
    and judicial powers, or either of them: the executive
    shall never exercise the legislative and judicial powers,
    or either of them: the judicial shall never exercise the
    legislative and executive powers, or either of them: to
    the end it may be a government of laws and not of men."
    11
    App. Ct. 903, 906 (2009) ("The Commonwealth retains the
    authority to make the determination in the first instance of the
    offense with which a person in the defendant's circumstance
    should be charged").   Indeed, a prosecutor has the discretion to
    charge a defendant under multiple enhancement statutes,
    retaining that discretion up to the sentencing stage, where, if
    the prosecutor chooses, he or she may file a nolle prosequi on
    all but one charge.    
    Richardson, 469 Mass. at 254
    -255.   See
    Bynum v. Commonwealth, 
    429 Mass. 705
    , 707 (1999) (§ 32A [d] is
    sentence enhancement provision rather than separate crime).
    Moreover, the decision to prosecute is "particularly ill-suited
    to judicial review."   Commonwealth v. Latimore, 
    423 Mass. 129
    ,
    136 (1996), quoting Wayte v. United States, 
    470 U.S. 598
    , 607
    (1985).
    Accordingly, a prosecutor does not infringe on the court's
    sentencing power merely by selecting charges from among multiple
    applicable subsections.   See 
    Cedeno, 404 Mass. at 196-197
    ("Prosecutors have wide ranges of discretion in deciding whether
    to bring criminal charges and in deciding what specific charges
    to bring").   See also Commonwealth v. Zwickert, 37 Mass. App.
    Ct. 364, 367 (1994) ("the grand jury, having before it evidence
    of the defendant's possession of cocaine with intent to
    distribute, might have framed the indictment as possession of a
    [c]lass B substance with intent to distribute, thus exposing the
    12
    defendant only to the lesser penalty of § 32A [a]); but because
    the indictment identified the Class B substance as cocaine, it
    was a charge under § 32A [c]").    The Batchelder Court similarly
    rejected the concern that legislative overlap had endowed the
    prosecutor with "unfettered" discretion:
    "[T]here is no appreciable difference between the
    discretion a prosecutor exercises when deciding whether to
    charge under one of two statutes with different elements
    and the discretion he exercises when choosing one of two
    statutes with identical elements. In the former situation,
    once he determines that the proof will support conviction
    under either statute, his decision is indistinguishable
    from the one he faces in the latter context."
    
    Batchelder, 442 U.S. at 125
    .   Compare 
    Cole, 468 Mass. at 304
    (invalidating under art. 30 statute authorizing parole board to
    impose new mandatory sentences).
    Section 32A thus does not represent an executive usurpation
    of judicial sentencing powers, but an appropriate exercise of
    prosecutorial discretion.   That discretion, although broad,
    remains constitutionally constrained by the equal protection
    clause of the Fourteenth Amendment to the United States
    Constitution.
    The equal protection clause prohibits selective enforcement
    "based upon an unjustifiable standard such as race, religion, or
    other arbitrary classification."   Oyler v. Boles, 
    368 U.S. 448
    ,
    456 (1962).   To prevail on a claim of selective prosecution, a
    defendant must demonstrate "that a broader class of persons than
    13
    those prosecuted has violated the law, . . . that failure to
    prosecute was either consistent or deliberate, . . . and that
    the decision not to prosecute was based on impermissible
    classification such as race, religion, or sex" (citations
    omitted).    Commonwealth v. Franklin, 
    376 Mass. 885
    , 894 (1978).
    Unless the defendant makes that prima facie showing, "we presume
    that criminal arrests and prosecutions are undertaken in good
    faith, without intent to discriminate."      Commonwealth v. King,
    
    374 Mass. 5
    , 22 (1977).    At oral argument, the defendant urged
    us to consider the issue of selective prosecution, but did not
    argue it in his brief or present us with a record that would
    allow us to evaluate such a claim.
    The judge's decision not to sentence the defendant
    pursuant to the statutes under which he was properly charged and
    convicted -- § 32A (c) and (d) -- was error.
    2.    The defendant's appeal.   a.   Motion to suppress.   After
    an evidentiary hearing, the motion judge found the following
    facts, which we supplement where necessary by uncontroverted
    testimony.     See Commonwealth v. Isaiah I., 
    448 Mass. 334
    , 337
    (2007), S.C., 
    450 Mass. 818
    (2008).       At approximately 2 A.M. on
    June 27, 2013, Boston police Officers Steven Dodd and Andrew
    Hunter were patrolling the Roxbury neighborhood of Boston.8      The
    8
    Dodd was the Commonwealth's only witness at the hearing,
    and the motion judge credited his testimony in its entirety.
    14
    officers were traveling in an unmarked cruiser on Norfolk
    Avenue.   As they approached the Burrell Street intersection,
    Dodd observed a motor vehicle turn onto Norfolk Avenue, veer
    slightly into the opposite lane, and begin traveling in the
    opposite lane on a two-way street.    Dodd activated his lights to
    initiate a traffic stop.
    Although Norfolk Avenue is a two-way street, the vehicle
    pulled over to the street's left side.   When Dodd approached, he
    observed the defendant's eyes to be red and glassy, and smelled
    the odor of burnt marijuana.   In initial conversation with the
    defendant, who was driving, Dodd observed the defendant's speech
    to be slurred.   A female passenger, not wearing a seat belt,
    also appeared impaired.    Dodd further observed on the front
    center console a plastic soda bottle containing a rolled-up
    sandwich bag.
    Upon request, the defendant produced a valid driver's
    license and an expired rental agreement for the motor vehicle.9
    When Dodd asked whether anyone had been smoking marijuana, the
    passenger responded that they had been smoking before leaving
    The defendant's only witness was his father.   The judge made no
    credibility findings about the father.
    9
    The one-week rental agreement was dated June 4, 2013.
    Therefore, by the time of the traffic stop, the vehicle should
    have been returned at least two weeks earlier. The motion judge
    did not credit testimony to the effect that the defendant had
    extended the agreement by telephone, where he produced no
    documentation in support of the claim.
    15
    Burrell Street.   The passenger produced a Massachusetts
    identification card but no driver's license, and was cited for
    failure to wear a seat belt.
    In the course of this preliminary investigation, Dodd
    formed the opinion that the defendant was operating a motor
    vehicle while under the influence of marijuana, and that his
    driving was impaired as a result.   Dodd concluded that he would
    not permit the defendant to resume operation of the vehicle,
    because he determined that to do so would create a danger to the
    public.   Without having yet decided whether he would make an
    arrest, Dodd ordered the defendant out of the vehicle in order
    to further assess his intoxication level.    No field sobriety
    tests were performed.
    At this time, Dodd also decided to have the vehicle towed
    and impounded for safekeeping.   He deemed the tow necessary
    because neither the defendant nor the passenger could safely
    operate the vehicle; the expired rental agreement created some
    question whether the defendant had lawful authority to operate
    the vehicle; and leaving the vehicle unattended in the stop's
    location could have left it vulnerable to larceny, given the
    known prevalence of break-ins in the area.
    When the defendant stepped out of the vehicle, Dodd
    observed him to be approximately six feet, five inches tall and
    300 pounds.   Dodd asked the defendant to step to the rear of the
    16
    vehicle for a patfrisk, which yielded nothing.   Dodd then
    informed the defendant that the officers would begin an
    inventory search of the vehicle.
    By this time, Boston police Sergeant Paul Quinn had arrived
    on scene to assist.    Dodd observed in the passenger's open purse
    a glass pipe, which he knew to be used in the smoking of
    marijuana.   He also saw in the purse a box of sandwich bags of
    the kind used in street-level drug distribution.     Inside the
    box, officers found a thumbtack, which they knew to be used to
    break off pieces of "crack" cocaine; they also observed a white
    residue on the tack's metal point.
    As Dodd and Quinn performed the search, Hunter stood with
    the defendant.   Through the silky material of the defendant's
    shirt, Hunter perceived several bumps protruding from the front
    shirt pocket.    When Hunter asked the defendant what they were,
    the defendant shoved Hunter and ran from the scene.    All three
    officers gave chase, shouting the command to stop.
    Crossing Norfolk Avenue, the defendant approached a field.
    The officers observed him reach into his pocket and throw items
    on the ground before they were able to overtake him in the
    field.   As they attempted to handcuff the defendant, he ignored
    orders to comply, pushed Hunter away, and kept one hand
    underneath his body.   During this struggle, the defendant spat
    from his mouth a small, knotted plastic bag containing crack
    17
    cocaine.   Dodd struck the defendant's face while holding a
    flashlight, and the blow lacerated the defendant's nose and
    subdued him such that the officers were able to handcuff and
    arrest him.
    Retracing their steps along the path of flight, officers
    later recovered keys to the defendant's vehicle and seventeen
    bags of crack cocaine.   These small bags were distinctively
    knotted like the one the defendant had spat from his mouth, and
    consistent with the packaging officers knew to be used in
    street-level sales.   A close-up photograph of the defendant at
    booking revealed glassy eyes and an intoxicated appearance
    consistent with Dodd's initial impression.
    The motion judge denied the defendant's motion to suppress,
    concluding that the officers had reasonable suspicion for the
    traffic stop and probable cause to arrest the defendant for
    operating a motor vehicle while under the influence; the search
    of the vehicle was a lawful inventory search; it was properly
    conducted within the scope of the Boston police motor vehicle
    inventory search policy; and the bags of crack cocaine were
    properly seized as abandoned by the defendant.
    The defendant challenges the denial of his motion to
    suppress, arguing that the evidence was obtained in violation of
    his rights under the Fourth Amendment to the United States
    Constitution and art. 14 of the Massachusetts Declaration of
    18
    Rights.   Specifically, he contends that the inventory search was
    pretextual and investigatory, and that any evidence subsequently
    seized is thus fruit of the poisonous tree.10,11   In reviewing a
    ruling on a motion to suppress, we accept the judge's findings
    of fact absent clear error, but review independently the judge's
    ultimate findings and conclusions of law.   Commonwealth v.
    Campbell, 
    475 Mass. 611
    , 615 (2016).
    Although a well-established exception to the warrant
    requirement, an inventory search must hew closely to written
    police procedures and may not conceal an investigatory motive.
    See South Dakota v. Opperman, 
    428 U.S. 364
    , 376 (1976);
    Commonwealth v. Rostad, 
    410 Mass. 618
    , 620 (1991).    The
    lawfulness of an inventory search turns on the threshold
    propriety of the vehicle's impoundment, and the Commonwealth
    bears the burden of proving the constitutionality of both.    See
    10
    The defendant does not contest that police had reasonable
    suspicion for the initial traffic stop. "Erratic" driving that
    violates the civil motor vehicle code may give rise to a
    reasonable suspicion that a driver is impaired, permitting an
    investigatory stop. Commonwealth v. Daniel, 
    464 Mass. 746
    , 756
    (2013). The motion judge explicitly credited the entirety of
    Officer Dodd's testimony, which included observations of the
    defendant's vehicle traveling on the wrong side of Norfolk
    Avenue. It was 2 A.M., and police reasonably suspected driver
    impairment. 
    Id. 11 The
    defendant also contends that the police lacked
    reasonable suspicion for the exit order and patfrisk. Because
    the patfrisk yielded no evidence, and because the determination
    to inventory the vehicle coincided with the exit order and
    preceded the patfrisk, we do not address this argument.
    19
    Commonwealth v. Eddington, 
    459 Mass. 102
    , 108 (2011);
    Commonwealth v. Ellerbe, 
    430 Mass. 769
    , 772-774 (2000).
    We have recognized three separate interests protected by
    warrantless inventory searches:   "the protection of the vehicle
    and its contents; the protection of the police and the tow
    company from false charges; and the protection of the public
    from the dangerous items which might be in the vehicle."
    
    Eddington, 459 Mass. at 108-109
    , quoting Commonwealth v. Garcia,
    
    409 Mass. 675
    , 682 (1991).   Against this backdrop, "[t]he
    impoundment of a vehicle for noninvestigatory reasons is
    generally justified if supported by public safety concerns or by
    the danger of theft or vandalism to a vehicle left unattended."
    Eddington, supra at 108, quoting Commonwealth v. Brinson, 
    440 Mass. 609
    , 612 (2003).
    Boston police department rule 103, § 31, provides for
    disposition of a vehicle in one of four ways:
    "1. leave it with a person having apparent authority to
    assume control of it; or
    "2. park it legally, close the windows, lock it, if
    possible, and attempt to notify the registered owner; or
    "3. leave it at the side of the road with windows closed
    and locked, if possible, if traffic is not obstructed and
    arrangements can be made for its removal without undue
    delay; or
    "4.   have it towed for safekeeping."
    The department's motor vehicle inventory search policy further
    20
    provides:   "A vehicle will be disposed of in the manner
    authorized in paragraph 4, when there is a danger to public
    safety; a danger to the vehicle being left unattended; a danger
    of theft or vandalism; or the possibility of false claims
    exists.   Therefore, an [i]nventory [s]earch will be performed."
    Because officers had determined that neither the defendant
    nor the passenger could safely operate the vehicle, the first
    option was unavailable.   Similarly, neither the second nor the
    third option was viable given the circumstances.   See 
    Eddington, 459 Mass. at 110
    (impoundment and inventory search of vehicle
    parked on public street and vulnerable to larceny was
    reasonable, where defendant had been arrested and passenger was
    intoxicated).   See also 
    Ellerbe, 430 Mass. at 775-776
    (same,
    where defendant arrested and passenger not in possession of
    driver's license).   Contrast Commonwealth v. Oliveira, 
    474 Mass. 10
    , 15-16 (2016) (impoundment unreasonable where vehicle could
    safely be left in parking lot for owner's retrieval).
    We entrust credibility determinations to the motion judge,
    Commonwealth v. Yesilciman, 
    406 Mass. 736
    , 743 (1990), and
    discern no error in her finding that the inventory search was
    not pretextual.   Because the impoundment and attendant inventory
    search were reasonable in scope and complied with written
    policy, no basis exists for the defendant's argument that the
    21
    evidence later seized was fruit of the poisonous tree.12
    b.   Motion for required finding of not guilty on assault
    and battery charge.     The evidence at trial was substantially the
    same as at the evidentiary hearing on the motion to suppress,
    augmented by the testimony of Officer Hunter and Sergeant Quinn,
    Boston police Officer Robert England, the defendant, and the
    defendant's father.13    The defendant argues that his motion for a
    required finding of not guilty on the charge of assault and
    battery on a police officer should have been allowed.    In
    reviewing the denial of a motion for a required finding of not
    guilty, we view the evidence in the light most favorable to the
    Commonwealth.   Commonwealth v. Latimore, 
    378 Mass. 671
    , 676-677
    (1979).   The defendant asks instead that we credit his testimony
    on self-defense.   Because this view improperly casts the
    12
    Where we conclude that the judge correctly denied the
    motion to suppress, we need not address the Commonwealth's
    challenge to the stay of the sentence, which was based on the
    sentencing judge's evaluation of the likelihood that the
    defendant would prevail on appeal regarding the motion to
    suppress. We note, however, that the judge erred in evaluating
    the likelihood of success of the appeal regarding the denial of
    the motion to suppress by relying on the evidence presented at
    trial, rather than the evidence presented at the motion to
    suppress hearing. See Commonwealth v. Grandison, 
    433 Mass. 135
    ,
    137 (2001) (when reviewing motion to suppress after trial, judge
    is limited to considering testimony at hearing on motion to
    suppress).
    13
    England did not investigate the defendant's case, instead
    testifying as a drug expert that eighteen individually packaged
    bags of crack cocaine were unlikely to have been for personal
    use.
    22
    evidence in the light most favorable to the defendant, we
    decline to adopt it.    Hrycenko v. Commonwealth, 
    459 Mass. 503
    ,
    510-511 (2011).    Viewed in the light most favorable to the
    Commonwealth, Officer Hunter's testimony that the defendant
    pushed him after he asked about the bumps in the defendant's
    shirt pocket was sufficient to support the conviction of assault
    and battery on a police officer.    See Commonwealth v. Deane, 
    458 Mass. 43
    , 52 (2010) (motion for required finding properly denied
    where sufficient evidence supported jury's rejection of
    defendant's version of events).
    c.    Self-defense instruction.   Finally, the defendant
    argues that his conviction of assault and battery on a police
    officer must be reversed because the jury instructions on self-
    defense impermissibly shifted the burden of proof to him.       Where
    the defendant raised no objection below, we review for a
    substantial risk of a miscarriage of justice.     Commonwealth v.
    King, 
    460 Mass. 80
    , 85 (2011).
    Here, the judge instructed to the effect that, if the jury
    believed the defendant's testimony that police pushed him first,
    the Commonwealth bore the burden of proving the absence of self-
    defense beyond a reasonable doubt.14    She did not define
    14
    Specifically, the judge instructed as follows:
    "Ladies and gentlemen, there's one additional point I
    want to make on the charge of assault and battery on a
    23
    reasonable self-defense, and the parties agree that her
    instructions were thus incomplete.
    "Where there is an erroneous jury instruction we review the
    entire charge to the jury to determine the interpretation a
    reasonable jury would place on the judge's words."     
    King, 460 Mass. at 85
    .   The instruction here, although erroneously
    incomplete, did not prejudice the defendant by impermissibly
    shifting the Commonwealth's burden to him.   Instead, the judge's
    prefatory language offered context for the instructions that
    proceeded twice to state the correct burden of proof.     Contrast
    Commonwealth v. Mejia, 
    407 Mass. 493
    , 494-496 (1990)
    (instruction that defendant had to show he had been assaulted as
    police officer. I've told you that the second element is
    that the defendant intended to touch and that the third
    element is that the touching was either likely to cause
    bodily harm to Officer Hunter or was done without his
    consent.
    "You have heard some testimony that the touching by
    [the defendant] came after Officer Hunter pushed him. If
    you believe that testimony, you may consider whether or not
    [the defendant] acted in reasonable self-defense.
    "So, if you find that the first pushing was done by
    Officer Hunter and that [the defendant's] response was
    reasonable self-defense, it is up to the Commonwealth to
    prove the absence of reasonable self-defense beyond a
    reasonable doubt.
    "So, if you believe that Officer Hunter pushed first,
    and any response by the defense was reasonable, the
    Commonwealth is obligated to prove beyond a reasonable
    doubt the absence of reasonable self-defense on the part of
    [the defendant]."
    24
    "precondition to assert[ing] the defense of self-defense" was
    prejudicial error); Commonwealth v. Harrington, 
    379 Mass. 446
    ,
    454-455 (1980) (instruction that "[s]elf-defense is available to
    a defendant only under [certain] circumstances" and is never
    "available" to aggressor was prejudicial error).     Here, the jury
    would have considered reasonable self-defense only if they first
    believed the defendant's version of events ("If you believe that
    testimony, you may consider whether or not [the defendant] acted
    in reasonable self-defense"), which they were free to discredit.
    This instruction created no substantial risk of a miscarriage of
    justice.
    3.     Conclusion.   For the foregoing reasons, the denials of
    the motion to suppress and motion for a required finding of not
    guilty are affirmed.     The defendant's convictions are also
    affirmed, but we remand to the Superior Court for resentencing
    on the counts of possession of cocaine with intent to
    distribute, pursuant to G. L. c. 94C, § 32A (c) and (d).
    So ordered.