United States v. Hilton ( 1999 )


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  •             United States Court of Appeals
    For the First Circuit
    No. 98-1513
    UNITED STATES OF AMERICA,
    Appellant,
    v.
    DAVID HILTON,
    Defendant, Appellee.
    APPEAL FROM THE UNITED STATES DISTRICT COURT
    FOR THE DISTRICT OF MAINE
    [Hon. Gene Carter, U.S. District Judge]
    Before
    Boudin, Circuit Judge,
    Coffin and Bownes, Senior Circuit Judges.
    F. Mark Terison, Assistant United States Attorney, with whom
    Jay P. McCloskey, United States Attorney, and Gail Fisk Malone,
    Assistant United States Attorney, were on brief for appellant.
    Peter E. Rodway for appellee.
    Lisa R. Green, Michael A. Bamberger, and Sonnenschein Nath &
    Rosenthal, for American Booksellers Foundation For Free Expression,
    Freedom To Read Foundation, International Periodical Distributors
    Association, Periodical and Book Association of America, Inc.,
    Publishers Marketing Association, Video Software Dealers
    Association, General Media Communications, Inc.; R. Bruce Rich and
    Jonathan Bloom for Association of American Publishers, Inc., on
    brief for amici curiae.
    January 27, 1999
    BOWNES, Senior Circuit Judge.  In 1996, Congress enacted
    the Child Pornography Prevention Act (the "CPPA"), 18 U.S.C.
    2252A, to attack the rise of computerized or "virtual" child
    pornography.  These images may take many forms   a photograph of
    a real child may be scanned and replicated, an innocent picture of
    a child may be manipulated by computer to create a sexually-
    oriented photo, or a fake child (ranging from a simple cartoon
    character to a high-resolution image resembling a real child) can
    be generated wholly by computer graphics.
    The law prohibits, inter alia, knowing possession of
    visual images depicting minors or those who "appear to be" minors
    engaging in sexually explicit conduct.  This case presents
    constitutional issues of first impression in this circuit:  whether
    the CPPA's definition of child pornography is so overbroad as to
    contravene the First Amendment or so vague as to violate due
    process.
    In resolving defendant David Hilton's motion to dismiss
    the indictment in his favor, the United States District Court for
    the District of Maine answered both questions in the affirmative.
    The court was troubled by a perceived difficulty in determining
    whether a depicted person appeared to be under 18 years old and by
    its belief that the statute impermissibly criminalizes possession
    of adult pornography.
    We reverse.  We hold that the law, properly construed,
    survives Hilton's facial constitutional challenge.  It neither
    impinges substantially on protected expression nor is so vague as
    to offend due process.
    I
    We assess the constitutionality of the CPPA de novo.  SeeUnited States v. DeLuca, 
    137 F.3d 24
    , 40 n.19 (1st Cir. 1998).  In
    doing so, we must carefully consider fundamental constitutional
    norms in light of recent technological advances to determine
    whether Congress's objectives and the statutory scheme it has
    established are in accord with our constitutional design.
    We begin by providing an overview of the CPPA and by
    considering the underlying legislative purposes of the Act.
    Congress enacted the CPPA to modernize federal law by enhancing its
    ability to combat child pornography in the cyberspace era.  See S.
    Rep. No. 104-358, at pt. I (1996) (declaring that statute addresses
    "problem of 'high-tech kiddie porn'").  Lawmakers wished to improve
    law enforcement tools to keep pace with technological improvements
    that have made it possible for child pornographers to use computers
    to "morph" or alter innocent images of actual children to create a
    composite image showing them in sexually explicit poses.  Through
    readily available desktop computer programs, one can even create a
    realistic picture of an imaginary child engaged in sexual activity
    and pass off that creation as an image of a real child.
    The statute's operative provisions, taken together,
    criminalize the reproduction, possession, sale, and distribution of
    child pornography.  See 18 U.S.C.  2252A(a).  They also prohibit
    the pandering of material as child pornography by making it a crime
    to advertise, promote, or present material "in such a manner that
    it conveys the impression that the material is, or contains" child
    pornography.  18 U.S.C.  2256(8)(D).
    The statute defines child pornography as:
    any visual depiction, including any photo-
    graph, film, video, picture, or computer or
    computer-generated image or picture, whether
    made or produced by electronic, mechanical, or
    other means, of sexually explicit conduct,
    where   (A) the production of such visual
    depiction involves the use of a minor engaging
    in sexually explicit conduct; (B) such visual
    depiction is, or appears to be, of a minor
    engaging in sexually explicit conduct;
    (C) such visual depiction has been created,
    adapted, or modified to appear that an
    identifiable minor is engaging in sexually
    explicit conduct; or (D) such visual depiction
    is advertised, promoted, presented, described,
    or distributed in such a manner that conveys
    the impression that the material is or
    contains a visual depiction of a minor
    engaging in sexually explicit conduct . . . .
    18 U.S.C.  2256(8).  A "visual depiction" includes   but is not
    necessarily limited to   "undeveloped film and videotape, and data
    stored on computer disk or by electronic means which is capable of
    conversion into a visual image."  18 U.S.C.  2256(5).  A "minor,"
    in turn, means "any person under the age of eighteen years."  18
    U.S.C.  2256(1).  Sexually explicit conduct is described as
    "actual or simulated   (A) sexual intercourse, including genital-
    genital, oral-genital, anal-genital, or oral-anal, whether between
    persons of the same sex or opposite sex; (B) bestiality; (C)
    masturbation; (D) sadistic or masochistic abuse; or (E) lascivious
    exhibition of the genitals or pubic area of any person."  18 U.S.C.
    2256(2).
    There is some overlap in the definition of child
    pornography   material created by manipulating an image of an
    "identifiable minor" would typically, but not necessarily, appear
    to be of a minor; similarly, an image showing an actual minor would
    probably also "appear to be a minor."  On the other hand, images of
    a purely fictional child might only satisfy the "appears to be a
    minor" test.  Under the statutory framework established by
    Congress, a defendant charged with unlawful distribution or sale
    would be entitled to a complete defense by showing that the person
    depicted actually was an adult (provided that the material was not
    promoted or presented to give the impression that it depicts an
    actual minor).  See 18 U.S.C.  2252A(c).  The affirmative defense
    is not made available, however, to those charged with unlawful
    possession of child pornography.
    Congress broadened the scope of federal anti-child
    pornography statutes to address a set of related concerns aimed at
    the ultimate goal of destroying the underground supply of child
    pornography in all of its manifestations.  First, the legislature
    desired to reduce the sheer volume of computerized child
    pornography that could be used by child molesters and pedophiles to
    "stimulate or whet their own sexual appetites."  S. Rep. 104-358,
    at pt. IV(B).
    Second, Congress sought to ban computer-generated images
    that are "virtually indistinguishable" from those of real children,
    but are made without live children.  
    Id.
      These images can be
    created with very little expense, and often are bought, sold, or
    traded in the same manner as images created through the use of real
    children.  They can be downloaded from Internet Web sites, viewed
    on computer screens, or stored on hard drives or floppy disks for
    later use.  Until now, such materials were largely beyond the reach
    of federal law, which had focused on representations of actual
    minors.
    Third, the new law was designed to protect the privacy of
    actual children whose innocuous images are altered to create
    sexually explicit pictures.  Lawmakers hoped to deter the creation
    of such invasive material and encourage the destruction of that
    which currently exists.  See id. at  2(7).
    Fourth, Congress wished to deprive child abusers of a
    "criminal tool" frequently used to facilitate the sexual abuse of
    children.  After hearing from an array of experts, Congress
    specifically found that virtual pornography created without the
    involvement of real minors (often via computer technology alone) is
    increasingly used by pedophiles and child molesters to seduce or
    entice children into participating in sexual activity by breaking
    down their natural inhibitions.  Congress determined that "a child
    who is reluctant to engage in sexual activity with an adult, or to
    pose for sexually explicit photographs, can sometimes be convinced
    by viewing depictions of other children 'having fun' participating
    in such activity."  Id. at 2(3).  This material is routinely used
    to instruct children how to perform certain sexual acts.  Images
    made by manipulating an innocent picture of a real child to show
    sexual conduct can also be used to blackmail that child into
    submitting to abuse and remaining in fearful silence about it.
    Congress deemed the threat of these forms of physical and emotional
    abuse to be as grave as when images of real children are used, for
    a child shown a computer-generated image cannot be expected to know
    whether the child portrayed in an image is that of a real child or
    merely a fanciful creation.
    II
    We recount the relatively short history of this case.  On
    December 17, 1997, a federal grand jury indicted Hilton for
    criminal possession of computer disks containing three or more
    images of child pornography in violation of 18 U.S.C.
    2252A(a)(5)(B).  Well before trial, Hilton moved to dismiss the
    indictment, mounting solely a facial attack on the CPPA.  He argued
    that the statute, by its terms, was unconstitutionally vague and
    overbroad, and therefore unenforceable.
    On March 26, 1998, the United States District Court for
    the District of Maine agreed.  The court determined that the CPPA
    was a content-neutral regulation "designed to ameliorate
    significant harmful secondary effects of the protected speech
    rather than suppress the speech itself."  United States v. Hilton,
    
    999 F. Supp. 131
    , 134 (D. Me. 1998).  Nevertheless, the court
    concluded that the statutory definition of "child pornography" was
    both vague and overbroad.  It found the "appears to be a minor"
    language overly subjective, creating "substantial uncertainty for
    viewers presented with materials depicting post-pubescent
    individuals" because it may be difficult to distinguish between
    teenagers and young adults.  
    Id. at 136
    .  The court further found
    the definition unconstitutionally overbroad, impacting a
    "significant amount of adult pornography featuring adults who
    appear youthful."  
    Id. at 137
    .  Despite holding this portion of the
    CPPA's definition of child pornography unconstitutional, the
    district court made no effort to ascertain the impact of its ruling
    on the statute as a whole by examining and applying the statute's
    severability clause.  Instead, it simply dismissed the indictment.
    The government now appeals.
    III
    The government attacks the district court's analysis in
    several critical respects.  It first questions the lower court's
    conclusion that the statute is overbroad.  In its view, the CPPA
    does not reach innocuous pictures of children or criminalize
    protected adult pornography.  The government also takes issue with
    the district court's determination that the Act is too vague.  The
    government urges us to hold that the statute allows persons of
    ordinary intelligence to determine what types of material are
    banned and to conform their conduct accordingly.  To require
    further specificity, it insists, would be not only impractical, but
    unrealistic.  Additionally, the government asks us to deem the
    "appears to be a minor" standard to be grounded in prosecutorial
    necessity because it is exceedingly difficult, if not impossible,
    for an expert to discern whether an image is one of a real child.
    The broadening of the definition of child pornography is critical,
    the government argues, because in more and more cases involving
    virtual child pornography, the prosecution is unable to prove that
    real children under a specified age are depicted.
    We turn our attention to familiar constitutional terrain.
    The First Amendment declares that "Congress shall make no law . .
    . abridging freedom of speech."  U.S. Const., amend. I.  We offer
    a few words about the doctrines that have developed over time to
    give meaning to the protective force of the First Amendment.  In
    general, laws that aim only to prescribe the conditions under which
    certain speech may be carried out may be upheld as neutral time,
    place or manner restrictions.  See United States v. Grace, 
    461 U.S. 171
    , 177 (1983) ("[T]he government may enforce reasonable time,
    place, and manner regulations as long as the restrictions 'are
    content neutral, are narrowly tailored to serve a significant
    government interest, and leave open ample alternative channels of
    communication.'") (citation omitted).  But a statute or regulation
    that discriminates based on the content of the speech itself
    typically must comport with the following standards to survive a
    constitutional challenge:  it must be (1) animated by one or more
    compelling state interests; and (2) narrowly tailored toward
    fulfilling those concerns.  Nevertheless, certain types of
    expression   chief among them fighting words, libel, and obscenity
    are unprotected altogether.  See R.A.V. v. City of St. Paul, 
    505 U.S. 377
    , 383-85 (1992).  Child pornography falls into the category
    of unprotected speech.  See New York v. Ferber, 
    458 U.S. 747
    , 764
    (1982).  Finally, an otherwise valid law may be so overbroad that
    it encroaches on protected expression or so vague that prosecuting
    a person under the statute would effectively deprive that person of
    due process of law.  See Kolender v. Lawson, 
    461 U.S. 352
    , 357-58
    (1983).
    For the sake of clarifying this area of law, we find it
    necessary to point out that the district court misapplied the time,
    place or manner doctrine by mistaking the CPPA for a content-
    neutral law.  A distinct line of cases upholds reasonably-crafted
    regulations where the state acts not to suppress certain speech but
    to direct, in a content-neutral way, how or when that speech may be
    expressed in the public sphere.  See, e.g., United States v.
    Kokinda, 
    497 U.S. 720
     (1990) (upholding federal regulation
    prohibiting solicitation on postal property).  Still, "[a]ny
    restriction on speech, the application of which turns on the
    content of the speech, is a content-based restriction regardless of
    the motivation that lies behind it."  Boos v. Barry, 
    485 U.S. 312
    ,
    335-36 (1988) (Brennan, J., concurring).  Of course, if a law is
    directed at the impact of the speech on its viewers, it cannot be
    evaluated as a time, place or manner restriction.  See Reno v.
    American Civil Liberties Union, 
    521 U.S. 844
    ,   , 
    117 S. Ct. 2329
    ,
    2342-43 (1997) (rejecting argument that Communications Decency Act,
    which banned on-line transmission of "obscene or indecent"
    messages, was time, place or manner regulation); Forsyth County v.
    Nationalist Movement, 
    505 U.S. 123
    , 134 (1992) ("Listeners'
    reaction to speech is not a content-neutral basis for
    regulation.").
    The CPPA fails both tests for substantive neutrality: it
    expressly aims to curb a particular category of expression (child
    pornography) by singling out that type of expression based on its
    content and banning it.  Blanket suppression of an entire type of
    speech is by its very nature a content-discriminating act.
    Furthermore, Congress has not kept secret that one of its
    motivating reasons for enacting the CPPA was to counter the primary
    effect child pornography has on those who view it.  See S. Rep.
    104-358, at pt. III, IV(A) (reflecting congressional concern that
    a "child molester or pedophile [may use] the material to whet his
    sexual appetites," that child pornography "poisons the minds and
    spirits of our youth," and that, if shown to children, the material
    may "make children more susceptible of acceding to sexual demands
    of would-be abusers); see also 
    id.
     at pt. IV(B) (observing that "a
    major part of the threat to children posed by child pornography is
    its effect on the viewers of such material").  For these related
    reasons, the child pornography law is plainly activated by a
    "content-based classification of speech."  Ferber, 
    458 U.S. at 763
    .
    Moreover, the statute makes no effort to permit
    alternative methods of disseminating or possessing the material in
    question.  In this respect, the district court also erred in
    finding that adequate alternative avenues of expression exist.  The
    CPPA is a quintessential content-specific statute, and therefore
    cannot be properly understood as a time, place or manner
    regulation.
    But to say that the CPPA is content-based does not end
    the matter, for it is well-settled that child pornography, an
    unprotected category of expression identified by its content, may
    be freely regulated.  We are asked to determine: first, whether the
    statute's definition of child pornography, expanded in an effort to
    outlaw computerized child pornography, satisfies the First
    Amendment; and second, assuming its sweep is appropriate, whether
    the law is adequately precise as to provide fair warning.
    To resolve these issues, we start by reviewing the
    Supreme Court's pronouncements on the government's power to
    regulate child pornography.  In Ferber, the Supreme Court first
    upheld the constitutionality of a state law proscribing the
    distribution of material depicting sexual performances by children
    under the age of 16.  See 
    458 U.S. 747
    .  In doing so, it carved out
    an entire category of speech "which, like obscenity, is unprotected
    by the First Amendment."  
    Id. at 764
    .  The Court likened child
    pornography to obscenity in that both kinds of expression may be
    banned, but explained that because of the state's "compelling
    interest in prosecuting those who promote the sexual exploitation
    of children," see 
    id. at 761
    , a law regulating child pornography
    need not adhere mechanistically to the three-part test for
    obscenity originally enunciated in Miller v. California, 
    413 U.S. 15
     (1973).  One reason for allowing a departure from the obscenity
    rule and, as a result, somewhat greater authority to regulate child
    pornography is that "a work which . . . contains serious literary,
    artistic, political, or scientific value may nevertheless embody
    the hardest core of child pornography."  
    Id.
    The Ferber Court did not establish a single one-size-
    fits-all constitutional definition of child pornography (as the
    Court arguably has done for obscenity), but provided general
    guiding principles.  Ultimately, to pass constitutional muster, a
    particular anti-child pornography statute must be "adequately
    defined."  
    458 U.S. at 764
    .  In Ferber, the Court pointed out that
    New York's prohibition was confined to works that "visually depict
    sexual conduct by children below a specified age."  
    Id.
     (Emphasis
    in original).  It was also persuaded that the law's definition of
    sexual activity was "suitably limited and described." 
    Id.
    The Court further developed the contours of its child
    pornography jurisprudence in Osborne v. Ohio, 
    495 U.S. 103
     (1990).
    There, the Court evaluated a state law prohibiting the possession
    and viewing of material depicting a nude minor "where such nudity
    constitutes a lewd exhibition or involves a graphic focus on the
    genitals."  A defendant charged with unlawful possession attacked
    the statute as overbroad and vague.  Rebuffing his twin challenges,
    the Court found that the statute was not aimed at controlling a
    person's private thoughts, but had been enacted to "protect victims
    of child pornography" and to "destroy[] a market for the
    exploitative use of children."  
    495 U.S. at 109
    .  The Osborne Court
    explicitly approved the following legislative goals:  stamping out
    child pornography because it often serves as a record of abuse of
    real children; and denying pedophiles and would-be child abusers
    access to child pornography, which could be used to seduce or
    coerce children into sexual activity.  See 
    id. at 110-11
    .  The
    former remains intricately tied to the need to protect real
    children represented in the pictures, but the latter marks a
    subtle, yet crucial, extension of a state's legitimate interest to
    the protection of children not actually depicted in prohibited
    images.
    As these cases demonstrate, the line between unprotected
    child pornography and otherwise protected expression (including
    possession of adult pornography, see Stanley v. Georgia, 
    394 U.S. 557
     (1969)) is not entirely tangle-free.  Nonetheless, four lessons
    can be drawn from the decisions.
    First, sexually explicit material may be seen to fall
    along a constitutional continuum entitling it to varying degrees of
    protection.  At one end of the spectrum, pictures of actual
    children in sexually compromising positions, deemed to have little
    or no social value, are entitled to no constitutional protection.
    At the opposite end of the spectrum, non-obscene images involving
    actual adults are entitled to full protection.  Sexually explicit
    material created without the benefit of a live child model but
    which appears to depict an actual minor, or produced by having an
    adult pose as a minor and later presented or sold as if it depicted
    as an actual minor, arguably falls somewhere in between.
    Second, considerations beyond preventing the direct abuse
    of actual children can qualify as compelling government objectives
    where child pornography is concerned.  When child pornography is
    the target, government is justified in not only driving it from the
    marketplace through aggressive anti-trafficking laws, but
    forbidding the private possession or personal viewing of these
    products altogether.  See Osborne, 
    495 U.S. at 110
     (approving of
    state's efforts to "stamp out this vice at all levels in the
    distribution chain").  In this sense, concerns about how adults may
    use child pornography vis-a-vis children and how children might
    behave after viewing it legitimately inform legislators' collective
    decision to ban this material.
    Third, in effecting such a prohibition, a criminal
    statute must cabin government authority by "adequately defin[ing]"
    the type of image that is to be forbidden.  The cases require not
    only that the term "minor" be defined, but also that the type of
    condemned sexual depiction be carefully described.
    Fourth, wherever the constitutional demarcation is to be
    properly drawn, "greater leeway" ought to be afforded legislatures
    to regulate sexual depictions of children.  Ferber, 
    458 U.S. at 756
    .  The Court's instruction to federal courts to permit Congress
    slightly more room to operate in this area is bolstered by its view
    that "[t]he value of permitting . . . photographic reproductions of
    children engaged in lewd sexual conduct is exceedingly modest, if
    not de minimis."  
    Id. at 762
    .  As a result, some discretion has
    been given legislatures to set out the parameters of anti-
    pornography restrictions.  For instance, the Court has repeatedly
    acknowledged that states have latitude to set the age at which an
    image is of a child rather than an adult.  See, e.g., United Statesv. X-Citement Video, Inc., 
    513 U.S. 64
    , 67 (1994) (upholding
    federal law that employs 18 as age of majority); Ferber, 
    458 U.S. at 749
     (law set age of majority at 16).  Congress and statehouses
    have some leeway in defining the kind of sexual depiction to be
    proscribed as well.  See X-Citement Video, 
    513 U.S. at 78-79
    (holding that it is constitutionally permissible to use either
    formulation   "lewd" or "lascivious" display of children's
    genitals).
    With this analytic framework in mind, we turn to the task
    of assessing the constitutionality of the CPPA.  The initial step
    is to ascertain the general scope of the statutory definition of
    child pornography, a task of pure statutory interpretation.
    Comparison of the law with prevailing constitutional precepts then
    follows.
    IV
    We first evaluate the district court's conclusion that
    the CPPA is unconstitutionally overbroad.  Overbroad statutes by
    their nature present a host of difficulties for our system of
    ordered liberty, not the least of which is a chilling effect on the
    communication of lawful ideas.  But a statute will not be
    invalidated as overbroad unless its overbreadth is "real, but
    substantial as well, judged in relation to the statute's plainly
    legitimate sweep."  Osborne, 
    495 U.S. at 112
     (citation omitted).
    As the Court has admonished, the overbreadth doctrine is "strong
    medicine" that should be utilized "only as a last resort."  Ferber,
    
    458 U.S. at 769
     (quoting Broadrick v. Oklahoma, 
    413 U.S. 601
    , 613
    (1973)).
    Judicial disinclination to employ the overbreadth
    doctrine is rooted in several important considerations.  The first
    is an appreciation for the "wide-reaching effects of striking down
    a statute on its face."  
    Id.
      Another related reason is that it may
    be inefficient to do so: facial invalidation is unwarranted if the
    likely number of lawful applications of the challenged statute far
    outstrips the few arguably problematic prosecutions under the law.
    It makes little sense to strike down an entire statute in response
    to a facial attack when potential difficulties can be remedied in
    future cases through fact-specific as-applied challenges.  A third
    reason to hesitate before invoking the overbreadth doctrine is that
    doing so may be unwise.  Deciding constitutional questions in the
    abstract is a recipe for making bad law.  See id. at 781 (Stevens,
    J., concurring) ("Hypothetical rulings are inherently treacherous
    and prone to lead us into unforeseen efforts; they are
    qualitatively less reliable than the products of case-by-case
    adjudication.").
    The key question, then, is whether the CPPA poses
    substantial problems of overbreadth sufficient to justify
    overturning the judgment of the lawmaking branches.  We conclude
    that it does not.  We begin with the language of the statute.  To
    the extent the CPPA criminalizes the possession, reproduction or
    distribution of a visual representation of an actual minor engaged
    in sexual conduct, it falls easily within the parameters
    established by Ferber and Osborne.  The government's interests in
    deterring the direct abuse of children and destroying the illicit
    child pornography trade amply justify these steps, and the CPPA's
    methods of eradicating such images are appropriate.
    Whether or not the prohibition of material that "appears
    to be" of a minor comports with the First Amendment is more
    troublesome.  At first blush, potential problems threaten to doom
    the law.  First and foremost, "appears" to whom?  The statute
    itself is silent as to whether the test is meant to be objective or
    subjective or some combination of the two.  On its face, the
    statute might also reach depictions with political, artistic,
    scientific, or educational value.  If so, it is unclear whether
    that would be constitutionally permissible.  And if, as Hilton and
    amici insist, the phrase "appears to be a minor" criminalizes
    possession of adult pornography created with models over the age of
    majority who look youthful, this too might pose additional
    constitutional difficulties.
    A correct interpretation of the "appears to be a minor"
    standard and a full understanding of the interplay between the
    legal protections afforded an individual, we believe, puts the bulk
    of these concerns to rest.  As to the breadth of the material
    covered by the statute, Congress's statements provide us with a
    precise and limited understanding of the "appears to be" language.
    We are obligated to follow it.  "Where a statute is susceptible of
    two constructions, by one of which grave and doubtful
    constitutional questions arise and by the other of which such
    questions are avoided, our duty is to adopt the latter."
    Almendarez-Torres v. United States, 
    523 U.S. 224
    ,   , 
    118 S. Ct. 1219
    , 1234 (1998) (Scalia, J., dissenting) (quoting United States
    ex rel. Attorney General v. Delaware and Hudson Co., 
    213 U.S. 366
    ,
    408 (1909)); see also Ferber, 
    458 U.S. at
    769 n.24 ("When a federal
    court is dealing with a federal statute challenged as overbroad, it
    should . . . construe the statute to avoid constitutional problems,
    if the statute is subject to such a limiting construction."); Viegav. McGee, 
    26 F.3d 1206
    , 1212 (1st Cir. 1994) ("In the absence of
    clear legislative intent, we will not adopt an interpretation of a
    statute that would render it constitutionally suspect.").
    We take our cue from the legislative record, which makes
    plain that the new language was intended to target only a narrow
    class of images   visual depictions "which are virtually
    indistinguishable to unsuspecting viewers from unretouched
    photographs of actual children engaging in identical sexual
    conduct."  S. Rep. 104-358, at pt. I, IV(B).  The Senate, in
    enacting S. 1237, explicitly stated that the "appears to be"
    language "applies to the same type of photographic images already
    prohibited, but which does not require the use of an actual minor
    in its production."  
    Id.
     at pt. IV(C).  The Senate clearly
    indicated that, by employing the phrase "appears to be," it was
    "extend[ing] [the prohibition against child pornography] from
    photographic depictions of actual minors engaging in sexually
    explicit conduct to the identical type of depiction, one which is
    virtually indistinguishable from the banned photographic
    depiction," and no further.  
    Id.
      (Emphasis added).
    A few observations logically flow from this narrow
    construct.  The primary one is that Congress meant only to extend
    federal authority in an important but limited fashion to a specific
    subset of visual images   those which are easily mistaken for that
    of real children.
    It follows that drawings, cartoons, sculptures, and
    paintings depicting youthful persons in sexually explicit poses
    plainly lie beyond the reach of the Act.  By definition, they
    would not be "virtually indistinguishable" from an image of an
    actual minor.  The CPPA therefore does not pose a threat to the
    vast majority of every day artistic expression, even to speech
    involving sexual themes.
    Hilton (and assorted amici) nevertheless insist that the
    First Amendment allows regulation of sexually explicit material
    only where actual children are abused in its creation.  They also
    contend that the statute is impermissibly expansive because it is
    very difficult to determine whether a person looks 17 or 18; they
    believe that the statute is bound to criminalize possession of
    protected adult pornography.
    Their first argument amounts to an effort to draw a
    bright line in an area of law in which courts have resisted
    creating clear-cut categories.  Relying on Ferber's discussion of
    the importance of protecting children from sexual exploitation,
    they argue that the Supreme Court has strictly limited regulation
    of child pornography to images manufactured with the use of live
    children.  But we find no firm basis for this overly restrictive
    reading of precedent.  We do not read the cases to say that
    Congress has power to remedy only the abuse of children during the
    process used to produce traditional forms of child pornography.
    While the Court certainly has been concerned with the "surpassing
    importance" of protecting the actual abuse of children who appear
    in pornographic material, it has not limited the government's
    authority to achieving that objective, and that objective alone.
    Ferber, 
    458 U.S. at 757
    .  Rather, it has mandated that government
    be permitted a certain degree of flexibility in how it chooses to
    grapple with new problems presented by the evolving nature of the
    child pornography industry.  See Osborne, 
    495 U.S. at 110
    .  The
    cases do suggest, however, that an appropriate set of governmental
    goals (and the government's methods of fulfilling those goals)
    should be reasonably related to the primary aim of "safeguarding
    the physical and psychological well-being" of children, and, by
    extension, crippling the clandestine child pornography trade.  Id.at 109 (citation omitted).
    The laws in force when the Court decided Ferber and
    Osborne uniformly defined child pornography by focusing on material
    involving the use of actual children.  The Court in those cases
    used, for purposes of its constitutional discussion, the statutory
    definition of child pornography then before it.  The legal issues
    presented in this case, including Congress's justifications offered
    for extending child pornography statutes to stem the flow of
    virtual child pornography, have not been analyzed by this, or any
    other, court of appeals.
    We think that it is a logical and permissible extension
    of the rationales in Ferber and Osborne to allow the regulation of
    sexual materials that appear to be of children but did not, in
    fact, involve the use of live children in their production.  Like
    sexually explicit material produced with actual children, there is
    little, if any, social value in this type of expression.  In
    constitutional terms, sexually explicit material produced without
    the benefit of a live child model but giving the appearance as if
    had been is more akin to traditionally unprotected child
    pornography than adult pornography.  The same is true of material
    created by having a youthful-looking adult pose as a minor that is
    sold or presented as though it contained a pornographic image of an
    actual minor.  Such depictions can be readily used so as to further
    the child pornography trade or to facilitate the abuse of children.
    The government's interest in safeguarding the welfare of
    children is compelling in these situations.  Computer-created or
    enhanced material can be bought, sold, or traded like any other
    form of child pornography, adding further fuel to the underground
    child pornography industry.  It can be used just as effectively as
    pictures of actual children to entice or blackmail children into
    cooperating with would-be abusers.  Moreover, the material may have
    been created through the abuse of an actual minor but altered so
    that it may be impossible to show that a real child was ever
    involved in its creation.  As technology improves and access to
    technology increases, efforts to eradicate the child pornography
    industry could be effectively frustrated if Congress were prevented
    from targeting sexually explicit material that "appears to be" of
    real children.  The government's interest in addressing these forms
    of child pornography is no less powerful than in instances where an
    actual child is actually used and abused during the production
    process.  We will not second-guess Congress's decision to address
    the social ills posed by the various types of virtual child
    pornography.
    Hilton's and amici's next objection also misses the mark.
    They maintain that the inherent difficulty of determining whether
    a depicted person "appears to be" 17 or 18 renders the definition
    overly broad.  They fear that persons will be convicted of
    possessing sexually explicit material of adults who look or dress
    in a youthful manner.  We think this danger is overstated.  The
    main flaw in the argument is its inordinate focus on the arguably
    fuzzy line between age 17 and 18, a line which, as with many laws,
    must be drawn somewhere.  More importantly, we are satisfied that
    the vast majority of prosecutions under the "appears to be a minor"
    provision would involve images of pre-pubescent children or persons
    who otherwise clearly appear to be under the age of 18.  Congress,
    relying on the opinion of experts, has determined that purveyors of
    child pornography usually cater to pedophiles, who by definition
    have a predilection for pre-pubertal children.  See S. Rep. 104-
    358, at  2, pts. IV(A), (C).  The apparent age of a pre-pubescent
    child can easily be established through objective proof.  While it
    is theoretically possible that there may be prosecutions of
    individuals selling or possessing images of youthful-looking
    adults, it is unlikely that they would comprise a substantial
    proportion of the prosecutions under the statute.
    The existence of a few possibly impermissible
    applications of the Act does not warrant its condemnation.  As the
    Court has repeatedly made plain, even if a statute at its margins
    infringes on protected activity, the solution is not invalidation
    of the entire scheme.  See Frisby v. Schultz, 
    487 U.S. 474
    , 488
    (1988) (declining to evaluate all "hypothetical applications" of
    ordinance in resolving facial challenge).  Whatever overbreadth may
    exist at the edges are more appropriately cured through a more
    precise case-by-case evaluation of the facts in a given case.  SeeNew York State Club Assoc., Inc. v. City of New York, 
    487 U.S. 1
    ,
    14 (1988).
    We recognize that the Court has said that adult models
    may be employed under certain circumstances to simulate minors
    posing in a sexually provocative manner for serious artistic,
    educational, or scientific purposes.  Indeed, in Ferber, the Court
    observed that "if it were necessary for literary or artistic value,
    a person over the statutory age who perhaps looked younger could be
    utilized."  
    458 U.S. at 763
    ; see also X-Citement Video, 
    513 U.S. at 72
     ("[N]on-obscene, sexually explicit materials involving persons
    over the age of 17 are protected by the First Amendment.").
    Take, for example, a film version of Nabokov's Lolita.
    A director might legitimately wish to employ a youthful-looking
    adult to portray, in a non-obscene manner, a sexual encounter
    between Lolita and Humbert.  Similarly, use of an adult model to
    simulate the sexual behavior of a child might be necessary for
    scientific research.  The social value of these works obviously
    could not be shrugged off as de minimis.  They would be far from
    the "hardest core of child pornography."  Ferber, 
    458 U.S. at 761
    .
    The First Amendment interest in permitting dissemination of such
    material would be sufficiently strong to warrant its protection.
    At the same time, the government's countervailing interest in
    protecting children "is likely to be far less compelling" when "the
    depiction is a serious contribution to art or science."  
    Id. at 776
    (Brennan, J., concurring).  Should the government decide to
    prosecute someone for distributing or possessing such material, we
    believe there would be an affirmative First Amendment defense
    available to the accused, although we need not define now its
    precise dimensions.  Recognizing such a defense is consistent with
    Congress's general view that the law generally "does not, and is
    not intended to, apply to a depiction produced using adults
    engaging in sexually explicit conduct, even where a depicted
    individual may appear to be a minor."  S. Rep. 104-358, at pt.
    IV(C).  It is also consonant with the Court's teachings in Ferber,
    where the Court assumed that even if in some rare instance the
    depiction of children performing sexual acts might be necessary for
    literary or artistic reasons, "a person over the statutory age who
    perhaps looked younger could be utilized."  
    458 U.S. at 763
    .
    We need not fully explore the details of this exception
    today.  Suffice it to say that the existence of a tiny fraction of
    material that could conceivably qualify for heightened protection
    but might nevertheless fall within the purview of the Act (i.e.,
    where youthful adults pose as children for sexually provocative
    images with redeeming social value) does not render the statute as
    a whole substantially overbroad.  The appropriate remedy is
    reversal of an unconstitutional conviction should the circumstance
    arise, not invalidation of the statute in toto at this stage.
    Once the phrase "appears to be a minor" is properly
    understood, the constitutional barriers fall away.  The fear of a
    chilling effect on protected speech subsides.  We conclude,
    therefore, that the CPPA is not unconstitutionally overbroad.
    V
    We next consider whether the district court erred in
    holding the CPPA unconstitutionally vague.  The touchstone of our
    system of justice is the right to fair warning of criminal charges.
    An ambiguous law fails to provide the requisite notice and
    undermines public confidence that the laws are equally enforced.
    The standard for overturning a law on vagueness grounds
    is a stringent one.  A statute will not be held void for vagueness
    unless it fails to "define the criminal offense with sufficient
    definiteness that ordinary people can understand what conduct is
    prohibited and in a manner that does not encourage arbitrary or
    discriminatory enforcement."  Kolender, 461 U.S. at 357; see alsoUnited States v. Bohai Trading Co., 
    45 F.3d 577
    , 580 (1st Cir.
    1995) (proper inquiry is whether statute "provide[s] a
    constitutionally adequate warning to those whose activities are
    governed") (citation omitted).  When a law directly impinges on
    freedom of expression, as the CPPA does here, we must scrutinize
    the law with an even more skeptical eye.  We are obliged do so
    because the threat of severe criminal sanctions and the full force
    of social stigma, coupled with uncertain notice of criminal
    liability offered by a poorly-worded statute, "may well cause
    speakers to remain silent rather than communicate even arguably
    unlawful words, ideas, and images."  Reno v. ACLU, 521 U.S. at   ,
    
    117 S. Ct. at 2345
    .
    The district court found the CPPA unduly vague because it
    believed the "appears to be a minor" standard to be purely
    subjective in nature.  To the contrary, we hold that the standard
    is an objective one.  A jury must decide, based on the totality of
    the circumstances, whether a reasonable unsuspecting viewer would
    consider the depiction to be of an actual individual less than 18
    engaged in sexual activity.  See S. Rep. 104-358, at pt. IV(C).
    Without limiting a priori the type of evidence that would
    be admissible on this question in a given case, the following proof
    could be offered to establish the apparent age of the person shown:
    the physical characteristics of the person; expert testimony as to
    the physical development of the depicted person; how the disk,
    file, or video was labeled or marked by the creator or the
    distributor of the image, or the defendant himself, see, e.g.,
    United States v. Robinson, 
    137 F.3d 652
    , 652 (1st Cir. 1998)
    (photographs labeled by names, dates taken, and ages of boys
    depicted); and the manner in which the image was described,
    displayed, or advertised.  While this list is hardly exhaustive, it
    gives a flavor of the ways in which a depicted person's apparent
    age might be objectively proven.
    The element of scienter also must be satisfied by the
    prosecution before a valid conviction may be obtained   for
    instance, the government must prove beyond a reasonable doubt that
    an individual "knowingly" possessed the child pornography.  See 18
    U.S.C.  2252A(a)(5)(B).  This statutory requirement serves as an
    additional safeguard, for the government must show not only that
    the individual purposefully acquired or distributed the material,
    but that he did so believing that the material was sexually
    explicit in nature and that it depicted a person who appeared to
    him to be (or that he anticipated would be) under 18 years old.
    See X-Citement Video, Inc., 
    513 U.S. at 78
     (holding that scienter
    requirement in related anti-child pornography statute "extends to
    both the sexually explicit nature of the material and to the age of
    the performers").
    The CPPA offers an added measure of protection.  It
    provides an affirmative defense if the person depicted actually was
    an adult at the time the image was created.  When the defense is
    appropriate, the fact that the person depicted was a live model at
    least 18 years of age typically will lead to dismissal of the
    charge.  Although Congress did not make the affirmative defense
    available to someone accused of unlawful possession (as opposed to
    any of the other offenses such as distribution), what an individual
    actually believed to be the age of the depicted person still goes
    to his state of mind in possessing the material.  Thus, a defendant
    who honestly believes that the individual depicted in the image
    appears to be 18 years old or older (and is believed by a jury), or
    who can show that he knew the images were created by having
    youthful-looking adults pose for them, must be acquitted, so long
    as the image was not presented or marketed as if it contained a
    real minor.
    We believe, in short, that the statute's provisions
    "suitably limit" the reach of the Act so that a person of ordinary
    intelligence can easily discern likely unlawful conduct and conform
    his or her conduct appropriately.  The statute carefully defines
    the term "minor."  The scope of its prohibition, like the law
    evaluated in Ferber, is restricted to visual images.  The statute
    describes, in painstaking detail, the types of sexually explicit
    depictions of children that are forbidden.  As the Court said in
    Osborne, such limiting language "avoid[s] penalizing persons for
    viewing or possessing innocuous photographs of naked children."
    
    495 U.S. at 114
    .
    We disagree with the district court's assumption that the
    use of a legal standard requiring an evaluation of the appearance
    of an image renders the test arbitrary or overly susceptible to
    manipulation.  Reasonable objective assessments of the impression
    conveyed by a person's actions or how an image "appears" are
    routinely made by judges and juries.  See, e.g., Liteky v. United
    States, 
    510 U.S. 540
    , 553 n.2 (1994) (noting that recusal motions
    under 28 U.S.C.  455(a) are governed by "objective appearance of
    partiality" test); Ferber, 
    458 U.S. at 751
     (approved definition of
    child pornography banned "simulated" sexual conduct, which in
    ordinary usage means "to have or take on the appearance of");
    Miller, 
    413 U.S. at 24
     (obscenity depends in part on whether
    material appeals to prurient interest of average person).
    Yet Hilton returns to a familiar refrain: that it is
    terribly difficult to distinguish between an apparent 17 year old
    and an apparent 18 year old.  This problem, he argues, renders the
    statute unduly vague (as well as overbroad).  We think not.  As
    discussed earlier, any number of objective signs should be enough
    to warn an ordinary viewer of sexually explicit material of the
    apparent age of the person depicted, including his or her physical
    characteristics and how the image is labeled or marketed.  And
    those involved in the production of lawful sexually explicit
    material can easily protect themselves by verifying the ages of the
    models they employ or by taking steps to visually demonstrate that
    a computer-generated image is meant to portray an adult.
    There is another reason why Hilton's vagueness challenge
    fails: there are few equally efficacious alternatives.  At oral
    argument, defense counsel suggested that a better approach would be
    to prohibit images of persons who are or appear to be "physically
    sexually immature."  Such a test, had Congress selected it, might
    very well have been more precise than the one Congress chose to
    adopt, which turns on the age or apparent age of the person
    depicted.  It is often said that because we are "[c]ondemned to the
    use of words, we can never expect mathematical certainty from our
    language."  Grayned v. City of Rockford, 
    408 U.S. 104
    , 109 (1972).
    That lesson applies here.
    But even if the proffered standard were more exact, there
    would still be a more fundamental problem   it would fail to reach
    a whole category of persons Congress intended to protect, namely,
    those youngsters who appear "physically sexually mature" but are
    under the age of consent.  We reject the suggestion that Congress
    must be confined to addressing pornographic images of some
    children, but not others.  Firmly satisfied that it is well within
    Congress's power to regulate virtual pornography of minors of all
    ages (infancy through age of majority as set by the legislature),
    we are aware of few other linguistic approaches that would achieve
    the same goals.  Defendant's proposal does not fit the bill.  The
    "appears to be a minor" test, by comparison, is sufficiently
    precise to pass constitutional muster and yet flexible enough to
    meet the challenges posed by computerized child pornography.
    We see no reason to strike down the CPPA as
    unconstitutionally vague.  The language of the statute affords an
    ordinary consumer of sexually explicit material adequate notice of
    the kinds of images to avoid.  The interaction between the
    applicable legal standards, moreover, offers the average person
    additional protection.  These safeguards, working in concert,
    minimize the danger that this law might be enforced in an arbitrary
    or discriminatory fashion by overzealous police officers or
    prosecutors.
    The judgment of the district court is reversed.