Cite as: 511 U. S. 485 (1994)
Opinion of the Court
ute focuses on the fact of the conviction and nothing suggests that the prior final conviction may be subject to collateral attack for potential constitutional errors before it may be counted.
Absent specific statutory authorization, Custis contends that an implied right to challenge the constitutionality of prior convictions exists under § 924(e). Again we disagree. The Gun Control Act of 1968, of which § 924(e) is a part, strongly indicates that unchallenged prior convictions may be used for purposes of § 924(e). At least for prior violent felonies, § 921(a)(20) describes the circumstances in which a prior conviction may be counted for sentencing purposes under § 924(e):
"What constitutes a conviction of . . . a crime shall be determined in accordance with the law of the jurisdiction in which the proceedings were held. Any conviction which has been expunged, or set aside or for which a person has been pardoned or has had civil rights restored shall not be considered a conviction for purposes of this chapter [18 U. S. C. §§ 921-930]."
The provision that a court may not count a conviction "which has been . . . set aside" creates a clear negative implication that courts may count a conviction that has not been set aside.
Congress' passage of other related statutes that expressly permit repeat offenders to challenge prior convictions that are used for enhancement purposes supports this negative implication. For example, 21 U. S. C. § 851(c), which Congress enacted as part of the Comprehensive Drug Abuse Prevention and Control Act of 1970, sets forth specific procedures allowing a defendant to challenge the validity of a prior conviction used to enhance the sentence for a federal drug offense. Section 851(c)(1) states that "[i]f the person denies any allegation of the information of prior conviction, or claims that any conviction alleged is invalid, he shall file
491
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