Yi v. Adams ( 2005 )


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  •                          PUBLISHED
    UNITED STATES COURT OF APPEALS
    FOR THE FOURTH CIRCUIT
    DAVID YI,                              
    Petitioner-Appellant,
    v.
    FEDERAL BUREAU OF PRISONS;
    VANESSA P. ADAMS, Warden of FCI-
    Petersburg,                                   No. 04-6891
    Respondents-Appellees.
    THE OFFICE OF THE FEDERAL PUBLIC
    DEFENDER,
    Amicus Supporting Appellant.
    
    Appeal from the United States District Court
    for the Eastern District of Virginia, at Richmond.
    Robert E. Payne, District Judge.
    (CA-03-436)
    Argued: March 18, 2005
    Decided: June 17, 2005
    Before WILLIAMS, MOTZ, and DUNCAN, Circuit Judges.
    Affirmed by published opinion. Judge Duncan wrote the opinion, in
    which Judge Williams and Judge Motz joined.
    COUNSEL
    ARGUED: Mark Owen Gabrielson, HOLLAND & KNIGHT, L.L.P.,
    Seattle, Washington, for Appellant. Tara Louise Casey, Assistant
    2                 YI v. FEDERAL BUREAU OF PRISONS
    United States Attorney, OFFICE OF THE UNITED STATES
    ATTORNEY, Richmond, Virginia, for Appellees. Sarah Sargent Gan-
    nett, OFFICE OF THE FEDERAL PUBLIC DEFENDER, Baltimore,
    Maryland, for Amicus Curiae. ON BRIEF: Christopher H. Howard,
    HOLLAND & KNIGHT, L.L.P., Seattle, Washington, for Appellant.
    Paul J. McNulty, United States Attorney, Alexandria, Virginia, for
    Appellees. James Wyda, Federal Public Defender, Baltimore, Mary-
    land, for Amicus Curiae.
    OPINION
    DUNCAN, Circuit Judge:
    David Yi appeals from the district court’s order denying his peti-
    tion for a writ of habeas corpus under 
    28 U.S.C. § 2241
    . Yi contends
    that he has earned more credit for "Good Conduct Time" than the
    Bureau of Prisons ("BOP") has awarded him under 
    18 U.S.C. § 3624
    ,
    a federal law that authorizes the BOP to reduce sentences for good
    behavior. For the following reasons, we affirm.
    I.
    Under 
    18 U.S.C. § 3624
    , prisoners who "display[ ] exemplary com-
    pliance with institutional disciplinary regulations" may earn credit
    toward the service of their sentence. 
    18 U.S.C. § 3624
    (b)(1). Credit
    for good conduct time ("GCT") is subtracted from the prisoner’s sen-
    tence, such that the prisoner becomes eligible for release before serv-
    ing the full sentence imposed by the sentencing court. 
    18 U.S.C. § 3624
    (a). The statute delegates authority to the BOP to calculate and
    award GCT credits. In particular, subsection (b) provides that:
    [A] prisoner who is serving a term of imprisonment of
    more than 1 year[,] other than a term of imprisonment for
    the duration of the prisoner’s life, may receive credit toward
    the service of the prisoner’s sentence, beyond the time
    served, of up to 54 days at the end of each year of the pris-
    oner’s term of imprisonment, beginning at the end of the
    first year of the term, subject to determination by the Bureau
    YI v. FEDERAL BUREAU OF PRISONS                       3
    of Prisons that, during that year, the prisoner has displayed
    exemplary compliance with institutional disciplinary regula-
    tions. . . . [I]f the Bureau determined that, during that year,
    the prisoner has not satisfactorily complied with such insti-
    tutional regulations, the prisoner shall receive no such credit
    toward service of the prisoner’s sentence or shall receive
    such lesser credit as the Bureau determines to be appropri-
    ate. . . . [C]redit for the last year or portion of a year of the
    term of imprisonment shall be prorated and credited within
    the last six months of the sentence.
    
    18 U.S.C. § 3624
    (b)(1).
    Yi is currently serving a 151-month sentence for his role in a con-
    spiracy to violate the Racketeer Influenced and Corrupt Organizations
    Act. 
    18 U.S.C. § 1962
    . Yi has been incarcerated since November 21,
    1994. Without credit for good behavior, he would be released upon
    the expiration of his sentence on June 22, 2007.
    The BOP has determined, however, that Yi can earn a maximum
    of 592 days of credit against his sentence under 
    18 U.S.C. § 3624
    .
    The BOP arrives at this figure by awarding up to 54 days’ GCT for
    each year the inmate serves in prison. For example, before this litiga-
    tion commenced, Yi served more than eight years of his 151-month
    sentence. After each year in prison, Yi received a credit of 54 days
    toward the service of his sentence for good behavior. Consequently,
    after serving eight years of his sentence, Yi accumulated a total of
    432 days’ GCT. Barring any disciplinary action, the BOP projects that
    Yi will earn an additional 160 days’ GCT as he serves out the remain-
    der of his sentence.1 Thus, the BOP expects to award Yi a total of 592
    days’ GCT under 
    18 U.S.C. § 3624
    . After subtracting the total
    amount of GCT that can be earned on his 151-month sentence, the
    1
    The 160 days are computed as follows: Yi can earn a maximum of
    108 days after serving his ninth and tenth year of imprisonment. In addi-
    tion, he can earn a prorated amount of 52 days for the last portion of a
    year that he serves. As noted earlier, Yi will not serve the full 151
    months of the sentence imposed; each annual GCT award reduces the
    amount of time that he will ultimately serve.
    4                  YI v. FEDERAL BUREAU OF PRISONS
    BOP has determined that Yi will become eligible for release on
    November 7, 2005.
    The BOP’s method of calculating GCT appears in BOP Program
    Statement 5880.28, which is part of the agency’s Sentencing Compu-
    tation Manual. The BOP has also promulgated a rule, pursuant to the
    notice and comment procedures of the Administrative Procedure Act,
    
    5 U.S.C. § 553
    , setting forth its interpretation of the GCT statute. The
    rule states that "[p]ursuant to 
    18 U.S.C. § 3624
    (b), . . . an inmate
    earns 54 days credit toward service of sentence (good conduct time
    credit) for each year served." 
    28 C.F.R. § 523.20
    .
    Yi contends that the BOP’s method of calculating GCT is contrary
    to the plain language of 
    18 U.S.C. § 3624
    . He argues that by using
    the phrase "term of imprisonment" in subsection (b), Congress
    intended that the agency award GCT based upon the length of the sen-
    tence imposed, not time actually served. Stated differently, Yi con-
    tends that "term of imprisonment" in subsection (b) means "sentence
    imposed," not "time served." Accordingly, Yi argues that the BOP
    must calculate GCT by multiplying his 151-month sentence by 54,
    which results in a maximum of 679 days2 of credit and his release in
    August of 2005.
    Importantly, under Yi’s interpretation of 
    18 U.S.C. § 3624
    , he is
    not required to serve a full year before he can receive credit for good
    behavior. Yi contends that the statute’s plain language entitles him to
    receive up to 54 days of credit within any given year of his sentence.
    Thus, in the first year of his sentence, if Yi exhibits good conduct for
    311 days, he would receive 54 days of credit. On the other hand, the
    BOP awards credit when it determines that an inmate has demon-
    strated a full year of compliance with prison disciplinary regulations.3
    2
    151 months/12 = 12.583 x 54 = 679 days’ GCT.
    3
    A prisoner may receive a prorated credit before serving a full year if
    the potential award of GCT credit would reduce his actual time served
    to less than a year. 
    28 C.F.R. § 523.20
    . For example, a prisoner serving
    a term of imprisonment of 366 days (the shortest term eligible for GCT
    under the statute) cannot wait until he has served a full year before
    receiving credit earned for good behavior. The credit due this inmate (54
    YI v. FEDERAL BUREAU OF PRISONS                       5
    Yi filed the instant habeas petition under 
    28 U.S.C. § 2241
    , assert-
    ing that the BOP calculates GCT in a manner that is contrary to 
    18 U.S.C. § 3624
    . The district court denied relief on the grounds that the
    plain language of the statute requires the computation of GCT on the
    basis of time actually served. In the alternative, the district court held
    that the BOP’s construction of the statute was reasonable under Chev-
    ron U.S.A., Inc. v. Natural Resources Defense Council, Inc., 
    467 U.S. 837
     (1984).
    Yi now appeals.
    II.
    We review the district court’s order denying Yi’s habeas petition
    de novo. Selgeka v. Carroll, 
    184 F.3d 337
    , 342 (4th Cir. 1999). In
    Chevron, the Supreme Court established a two-step process to guide
    judicial review of an agency’s interpretation of a statute. First, we
    must determine whether the plain language of the statute directly
    addresses the precise question before us. "If the intent of Congress is
    clear, that is the end of the matter; for the court, as well as the agency,
    must give effect to the unambiguously expressed intent of Congress."
    Chevron, 
    467 U.S. at 842-43
    . However, if the statute is silent or
    ambiguous in expressing Congress’ intent, we defer to the agency’s
    reasonable construction of the statute. 
    Id. at 843-44
    .
    A.
    In this case, the precise question before us is whether GCT must
    be awarded based upon the length of a prisoner’s sentence or his time
    actually served. Of course, "the first place we must look to see if Con-
    gress has spoken to the issue with which we are concerned and
    whether Congressional intent in that regard is clear is on the face of
    days) would exceed the time remaining on his sentence of imprisonment
    (one day). Recognizing this, the statute authorizes the BOP to award a
    prorated credit of 47 days, reducing the inmate’s actual time served to
    319 days. See Pacheco-Camacho v. Hood, 
    272 F.3d 1266
    , 1267-68 (9th
    Cir. 2001) (discussing practice of awarding prorated credit for service of
    less than a year).
    6                  YI v. FEDERAL BUREAU OF PRISONS
    the statute." Kofa v. INS, 
    60 F.3d 1084
    , 1088 (4th Cir. 1995) (en
    banc). In determining whether a statute is clear, we are guided "by
    reference to the language itself, the specific context in which that lan-
    guage is used, and the broader context of the statute as a whole." Rob-
    inson v. Shell Oil Co., 
    519 U.S. 337
    , 341 (1997).
    Yi contends that by directing the BOP to award "up to 54 days at
    the end of each year of the prisoner’s term of imprisonment," Con-
    gress plainly intended that the agency calculate GCT based upon the
    sentence imposed, not time served. 
    18 U.S.C. § 3624
    (b)(1) (emphasis
    added). Significant to his argument is the fact that the phrase "term
    of imprisonment" appears three times within the first sentence of sub-
    section (b):
    [A] prisoner who is serving a term of imprisonment of more
    than 1 year[,] other than a term of imprisonment for the
    duration of the prisoner’s life, may receive credit toward the
    service of the prisoner’s sentence, beyond the time served,
    of up to 54 days at the end of each year of the prisoner’s
    term of imprisonment . . . .
    
    Id.
     (emphasis added).
    Without question, the first two references to "term of imprison-
    ment" in subsection (b) refer to the sentence imposed. The statute
    declares that the BOP may award credit only to prisoners serving a
    term of imprisonment of more than one year, with the exception of
    prisoners serving a life sentence. "In this part of the statute, ‘term of
    imprisonment’ must . . . refer to the sentence [imposed] because the
    Bureau has to determine whether a prisoner is eligible for the credit
    on the first day he arrives in prison." White v. Scibana, 
    390 F.3d 997
    ,
    1001 (7th Cir. 2004). Invoking the parallelism canon of statutory con-
    struction, Yi argues that a given term cannot change meanings within
    the same sentence. See Brown v. Gardner, 
    513 U.S. 115
    , 118 (1994)
    ("[T]here is a presumption that a given term is used to mean the same
    thing throughout a statute, a presumption surely at its most vigorous
    when a term is repeated within a given sentence . . . .") (citation omit-
    ted). Thus, Yi argues that "term of imprisonment" must also mean
    "sentence imposed" when it is used for the third time in 
    18 U.S.C. § 3624
    (b). Several district courts have agreed with this reasoning and
    YI v. FEDERAL BUREAU OF PRISONS                    7
    have held that the statute unambiguously requires the calculation of
    GCT based upon the sentence imposed. See Moreland v. Fed. Bureau
    of Prisons, 
    363 F. Supp. 2d 882
    , 886 (S.D. Texas 2005), adopted by,
    
    2005 U.S. Dist. LEXIS 6010
     (S.D. Tex. March 31, 2005); Williams
    v. DeWalt, 
    351 F. Supp. 2d 412
    , 418 (D. Md. 2004); White v. Scibana,
    
    314 F. Supp. 2d 834
    , 841 (W.D. Wis. 2004), rev’d, 
    390 F.3d 997
     (7th
    Cir. 2004).
    We agree that Yi’s construction of 
    18 U.S.C. § 3624
    (b) is plausi-
    ble; however, we do not agree that the statutory language unambigu-
    ously compels this interpretation alone. In fact, no circuit court that
    has addressed this issue has concluded that Yi’s interpretation of the
    statute is compelled by its text. See White, 
    390 F.3d at 1002
     ("[I]t is
    impossible to make sense of 
    18 U.S.C. § 3624
     while giving the phrase
    ‘term of imprisonment’ one meaning throughout."); see also
    O’Donald v. Johns, 
    402 F.3d 172
    , 174 (3d Cir. 2005) (per curiam)
    ("[I]t is unclear whether the phrase ‘term of imprisonment,’ as used
    several times in § 3624(b), refers to the sentence imposed or time
    served."); Sample v. Morrison, No. 04-40698, 
    2005 U.S. App. LEXIS 4708
    , at *6-7 (5th Cir. March 22, 2005) (per curiam) (rejecting, in
    dicta, contention that GCT statute requires computation of credit
    based upon "sentence imposed"); Perez-Olivo v. Chavez, 
    394 F.3d 45
    ,
    49 (1st Cir. 2005) ("term of imprisonment" in GCT statute is ambigu-
    ous); Pacheco-Camacho v. Hood, 
    272 F.3d 1266
    , 1268 (9th Cir.
    2001) (statutory language unclear concerning whether GCT must be
    awarded according to sentence imposed or time served).
    For example, in White, the Seventh Circuit observed that interpret-
    ing "term of imprisonment" to mean "sentence imposed" in subsection
    (b) conflicts with the fundamental purpose of the statute, which is to
    award credit "at the end of each year" on account of the prisoner’s
    good behavior "during that year." White, 
    390 F.3d at 1001
    . Specifi-
    cally, the court explained that:
    The statute . . . establishes a process of awarding credit at
    the end of each year of imprisonment based on a review of
    the prisoner’s behavior during that year, a process that
    would be undermined if "term of imprisonment" means
    "sentence imposed." This is because the accumulation of
    good-time credit reduces the amount of time a prisoner will
    8                  YI v. FEDERAL BUREAU OF PRISONS
    ultimately spend in prison, sometimes (as in White’s case)
    by more than an entire year. The Bureau cannot evaluate a
    prisoner’s behavior and award credit if the prisoner is not
    still in prison.
    
    Id.
    The problem with awarding credit for every year of the "sentence
    imposed" is illustrated in this case. After serving eight years of his
    151-month sentence, Yi earned 432 days of GCT, reducing the time
    that he will ultimately serve in prison by more than a year. After sub-
    tracting 432 days from his sentence, Yi will serve no portion of the
    last year of his sentence imposed. Nevertheless, Yi contends that an
    inmate should receive GCT for every year (or partial year) of the sen-
    tence imposed. However, to award credit for time not served would
    conflict with Congress’ intent that prisoners "earn" credit under the
    GCT statute by "display[ing] exemplary compliance with institutional
    disciplinary regulations" during the year. 
    18 U.S.C. § 3624
    (b); see
    also Sample, 
    2005 U.S. App. LEXIS 4708
    , at *3 ("[T]he statute
    makes clear that good time credit must be earned by a prisoner on an
    annual basis; it is not awarded in advance.") (emphasis added). An
    inmate who is not in prison cannot "earn" credit for compliance with
    prison disciplinary regulations.
    Other courts have noted that the interpretation advanced by Yi
    would undermine the basic design of the statute. For example, the
    Third Circuit has observed that:
    To calculate GCT based on the sentence imposed would
    allow an inmate to earn GCT for time he was not actually
    incarcerated. This unseemly result would frustrate the pro-
    cess and militates against finding that the phrase "term of
    imprisonment" unambiguously refers to the sentence
    imposed.
    O’Donald, 
    402 F.3d at 174
     (internal citation omitted). As another
    court has explained:
    The statute awards GCT based upon BOP’s determination
    that "during that year" the prisoner complied with institu-
    YI v. FEDERAL BUREAU OF PRISONS                     9
    tional disciplinary regulations. Such a directive requires that
    the prisoner has been incarcerated during that year so that
    his compliance may be measured. Therefore, granting GCT
    for years that will not be served is illogical, because compli-
    ance with disciplinary rules during those years is not possi-
    ble.
    Pasciuti v. Drew, No. 9:04-CV-043(LEK), 
    2004 U.S. Dist. LEXIS 10352
    , at *17 (N.D.N.Y. June 2, 2004) (unpublished).
    Similarly, the statute authorizes the BOP to award lesser credit, or
    none at all, if it determines that a prisoner has failed to comply with
    disciplinary regulations "during [the] year." 
    18 U.S.C. § 3624
    (b)(1).
    The statute therefore assumes that the prisoner has been incarcerated
    during the year, such that the BOP can determine that his less than
    satisfactory compliance with institutional regulations deserves less
    than the full amount of credit authorized under the statute.
    For the same reason, Yi’s interpretation of the GCT statute also
    conflicts with the mandate that "credit for the last year or portion of
    a year of the term of imprisonment shall be prorated . . . ." 
    18 U.S.C. § 3624
    (b)(1) (emphasis added). Again, the accumulation of good
    behavior credit often reduces the amount of time a prisoner serves by
    more than an entire year. Consequently, the prisoner is released
    before serving any portion of the last year of the sentence imposed
    by the sentencing court. Thus, if we accepted Yi’s argument that
    "term of imprisonment" means "sentence imposed," it would become
    impossible to award prorated credit under the GCT statute without
    awarding credit for time not served. As we have already concluded,
    awarding credit for time not served would conflict with the funda-
    mental design of the statute, which is to award credit "at the end of
    each year" on account of the prisoner’s good behavior "during that
    year." White, 
    390 F.3d at 1001
    ; 
    18 U.S.C. § 3624
    (b)(1). Similarly, a
    prisoner cannot "earn" a prorated credit for time not served. Sample,
    
    2005 U.S. App. LEXIS 4708
    , at *3.
    Broadening our focus now to "the statute as a whole," Robinson,
    
    519 U.S. at 341
    , we find that Congress clearly used the phrase "term
    of imprisonment" to mean "time served" in a different subsection of
    
    18 U.S.C. § 3624
    . Specifically, subsection (d) provides that:
    10                 YI v. FEDERAL BUREAU OF PRISONS
    Upon the release of a prisoner on the expiration of the pris-
    oner’s term of imprisonment, the Bureau of Prisons shall
    furnish the prisoner with . . . suitable clothing[,] . . . an
    amount of money, not more than $500, . . . and . . . transpor-
    tation to the place of the prisoner’s conviction . . . .
    
    18 U.S.C. § 3624
    (d). As Yi interprets the statute, a prisoner would
    receive these benefits at the end of the "sentence imposed," which is
    obviously too late in the case of an inmate who (as a result of annual
    GCT credits) has been released from prison before serving the full
    sentence imposed. In Yi’s case, the stipends would not be paid until
    almost two years after his release. Clearly, Congress did not intend
    this absurd result.
    Accordingly, we agree with the courts that have found ambiguous
    the phrase "term of imprisonment" as it is used in 
    18 U.S.C. § 3624
    to describe how GCT is awarded. We acknowledge the strong pre-
    sumption that identical terms used in the same sentence of a statute
    carry the same meaning. Brown, 
    513 U.S. at 118
    . However, as the
    Supreme Court has explained, the
    presumption is not rigid and readily yields whenever there
    is such variation in the connection in which the words are
    used as reasonably to warrant the conclusion that they were
    employed in different parts of the act with different intent.
    General Dynamics Land Sys., Inc. v. Cline, 
    540 U.S. 581
    , 595 (2004)
    (internal quotations omitted). As the preceding analysis demonstrates,
    we believe that this is precisely the case with respect to the phrase
    "term of imprisonment" in 
    18 U.S.C. § 3624
    (b).
    B.
    Because the language of the statute is unclear, we may consult its
    legislative history as a guide to congressional intent. United States v.
    Rast, 
    293 F.3d 735
    , 737 (4th Cir. 2002) ("The confusing statutory lan-
    guage allows us to look beyond the text for clues about congressional
    intent."); see also Bedrock Ltd., LLC v. United States, 
    541 U.S. 176
    ,
    187 n.8 (2004) (noting that "longstanding precedents . . . permit resort
    YI v. FEDERAL BUREAU OF PRISONS                    11
    to legislative history only when necessary to interpret ambiguous stat-
    utory text.").
    Principally, Yi argues that we must read 
    18 U.S.C. § 3624
    (b) to
    require the computation of GCT based on the "sentence imposed"
    because the prior version of the statute calculated GCT in this man-
    ner. Under 
    18 U.S.C. § 4161
     (repealed), a model prisoner could serve
    less time by earning credit for good behavior against "the term of his
    sentence." 
    18 U.S.C. § 4161
     (repealed). In relevant part, this law pro-
    vided that:
    Each prisoner convicted of an offense against the United
    States and confined in a penal or correctional institution for
    a definite term other than for life, whose record of conduct
    shows that he has faithfully observed all the rules and has
    not been subjected to punishment, shall be entitled to a
    deduction from the term of his sentence[,] beginning with
    the day on which the sentence commences to run . . . .
    
    Id.
     In 1984, Congress repealed 
    18 U.S.C. § 4161
     and codified the cur-
    rent GCT statute as part of the Comprehensive Crime Control Act.
    See Pub. L. No. 98-473, 
    98 Stat. 1976
     (1984). Yi contends that noth-
    ing in the language of the new statute or its legislative history sug-
    gests that Congress intended to change the previous practice of
    awarding GCT based upon the sentence imposed.
    We disagree. Although Congress was mainly concerned with sim-
    plifying the computation of GCT under the prior statute,4 the new law
    ended the practice of awarding credit "beginning on the day on which
    the sentence commences to run[.]" 
    18 U.S.C. § 4161
     (repealed). In the
    current statute, Congress directs the BOP to award credit "beginning
    at the end of the first year of the term[.]" 
    18 U.S.C. § 3624
    (b)(1)
    (emphasis added). This revision of the statute is consistent with the
    4
    The previous system authorized different rates of GCT—five, six,
    seven, eight, or ten days—depending upon the length of the sentence
    imposed. 
    18 U.S.C. § 4161
     (repealed). "An overarching purpose of the
    new GCT statute was to make the computation of credit toward early
    release pursuant to section 3624(b) considerably less complicated than
    under [prior] law." Perez-Olivo, 
    394 F.3d at 50
     (quotations omitted).
    12                 YI v. FEDERAL BUREAU OF PRISONS
    view, contrary to that advanced by Yi, that Congress intended to
    replace the practice of computing GCT according to the sentence
    imposed with a system that rewards inmates retrospectively "at the
    end of each year" for compliance with disciplinary regulations "dur-
    ing that year." 
    18 U.S.C. § 3624
    (b)(1). At best, the statute remains
    unclear as to whether GCT should be awarded based upon time
    served or the sentence imposed. Accordingly, we agree with the
    courts that have held that the legislative history of the GCT statute
    does not resolve the ambiguity in 
    18 U.S.C. § 3624
    (b). Perez-Olivo,
    
    394 F.3d at 50
     ("[T]he legislative history of the GCT statute . . . does
    not indicate any congressional intent to calculate GCT based on ‘time
    served’ or ‘sentence imposed.’"); Pacheco-Camacho, 
    272 F.3d at 1269-70
     (legislative history of GCT statute does not remove ambigu-
    ity).
    C.
    Having found that "term of imprisonment" in 
    18 U.S.C. § 3624
    (b)
    is ambiguous, we must determine whether the BOP’s interpretation of
    the statute is reasonable and therefore entitled to deference. Chevron,
    
    467 U.S. at 843-44
    .5 In so doing, we "may not substitute [our] own
    construction of [the] statutory provision for a reasonable interpreta-
    tion made by the [BOP]." 
    Id. at 844
    . Instead, we must uphold the
    agency’s interpretation if it is "rational and consistent with the stat-
    ute." NLRB v. United Food & Commercial Workers Union Local 23,
    
    484 U.S. 112
    , 123 (1987).
    We conclude that the BOP has reasonably interpreted the statute so
    as to require the calculation of GCT based upon the inmate’s time
    5
    "A precondition to deference under Chevron is a congressional dele-
    gation of administrative authority." Adams Fruit Co. v. Barrett, 
    494 U.S. 638
    , 649 (1990). The BOP’s construction of the statute, which appears
    in Program Statement 5880.28 and 
    28 C.F.R. § 523.20
    , "falls within the
    implied statutory authority of the BOP." Pacheco-Camacho, 
    272 F.3d at 1270
    ; see also White, 
    390 F.3d at 1001
     ("The Bureau’s discretion to
    resolve ambiguities in the good-time statute is implicit in its statutory
    authority to determine and award good time and to release prisoners
    when their sentences, as adjusted by the Bureau for good time credit,
    have expired.").
    YI v. FEDERAL BUREAU OF PRISONS                    13
    served. The view that a prisoner should accrue 54 days of credit for
    each 365 days of good behavior is consistent with Congress’ mandate
    that the BOP reward a prisoner "at the end of each year" for good
    behavior demonstrated "during that year." 
    18 U.S.C. § 3624
    (b)(1).
    This language reflects "a clear congressional directive that the BOP
    look retroactively at a prisoner’s conduct over the prior year, which
    makes it reasonable for the BOP only to award GCT for time served."
    Perez-Olivo, 
    394 F.3d at 53
    . Accordingly, we defer to the BOP’s rea-
    sonable construction of 
    18 U.S.C. § 3624
    (b). Chevron, 
    467 U.S. at 843-44
    .
    D.
    Lastly, we consider Yi’s argument that the rule of lenity should
    apply to resolve the ambiguity in 
    18 U.S.C. § 3624
    (b) in his favor.
    We conclude that it should not.
    The rule of lenity holds that "where there is ambiguity in a criminal
    statute,6 doubts are resolved in favor of the defendant." United States
    v. Bass, 
    404 U.S. 336
    , 348 (1971). The rule applies "not only to
    resolve issues about the substantive scope of criminal statutes, but to
    answer questions about the severity of sentencing." United States v.
    R.L.C., 
    503 U.S. 291
    , 305 (1992). "The rule of lenity is premised on
    two ideas: First, a fair warning should be given to the world in lan-
    guage that the common world will understand, of what the law
    intends to do if a certain line is passed; second, legislatures and not
    courts should define criminal activity." Babbitt v. Sweet Home Chap-
    ter of Cmtys., 
    515 U.S. 687
    , 704 n.18 (1995) (internal quotations
    omitted). Yi argues that, in light of these principles, we should read
    
    18 U.S.C. § 3624
     to require that the BOP calculate GCT according to
    the sentence imposed.
    We need not resort to the rule of lenity in this case for two reasons.
    First, BOP Program Statement 5880.28 and 
    28 C.F.R. § 523.20
     pro-
    vide the public with sufficient notice that GCT shall be awarded
    6
    We assume, without deciding, that 
    18 U.S.C. § 3624
     is a "criminal
    statute" in whose context the rule is properly invoked. See Perez-Olivo,
    
    394 F.3d at 53
     (expressing doubt concerning whether federal GCT law
    is a "criminal" statute that invokes the rule of lenity).
    14                 YI v. FEDERAL BUREAU OF PRISONS
    based upon time actually served. Thus, while the language of the stat-
    ute is ambiguous, the Program Statement and the regulation "give[ ]
    the public sufficient warning to ensure that nobody mistakes the ambit
    of the law or its penalties." Pacheco-Camacho, 
    272 F.3d at 1272
    ; see
    also Perez-Olivo, 
    394 F.3d at 53-54
     (holding that rule of lenity does
    not apply); O’Donald, 
    402 F.3d at 174
     (same). Second, 
    18 U.S.C. § 3624
     is a statute that Congress has charged the BOP to administer.
    Rather than apply a presumption of lenity to resolve the ambiguity,
    Chevron requires that we defer to the agency’s reasonable construc-
    tion of the statute. "Chevron deference is a tool of statutory construc-
    tion whereby courts are instructed to defer to the reasonable
    interpretations of expert agencies charged by Congress to fill any gap
    left, implicitly or explicitly, in the statutes they administer." America
    Online, Inc. v. AT&T Corp., 
    243 F.3d 812
    , 817 (4th Cir. 2001) (inter-
    nal quotations and emphasis omitted). As one court has explained:
    [D]eference trumps lenity when courts are called upon to
    resolve disputes about ambiguous statutory language, at
    least where the agency interpreting the criminal statute is:
    (1) responsible for administering the statute; and (2) that
    agency has promulgated its interpretation pursuant to the
    notice and comment provisions of the Administrative Proce-
    dure Act.
    Sash v. Zenk, 
    344 F. Supp. 2d 376
    , 383 (E.D.N.Y. 2004). Thus, the
    rule of lenity does not require that we adopt Yi’s interpretation of 
    18 U.S.C. § 3624
    (b).
    Accordingly, the district court’s order dismissing Yi’s petition for
    a writ of habeas corpus is
    AFFIRMED.