18 U.S.C. § 3565: Revocation of probation

continue him on probation, with or without extending the term or modifying or enlarging the conditions; or revoke the sentence of probation and resentence the defendant under subchapter A. possesses a controlled substance in violation of the condition set forth in section 3563(a)(3); possesses a firearm, as such term is defined in section 921 of this title , in violation of Federal law, or otherwise violates a condition of probation prohibiting the defendant from possessing a firearm; refuses to comply with drug testing, thereby violating the condition imposed by section 3563(a)(4); 1 or 1 See References in Text note below. as a part of drug testing, tests positive for illegal controlled substances more than 3 times over the course of 1 year; The power of the court to revoke a sentence of probation for violation of a condition of probation, and to impose another sentence, extends beyond the expiration of the term of probation for any period reasonably necessary for the adjudication of matters arising before its expiration if, prior to its expiration, a warrant or summons has been issued on the basis of an allegation of such a violation.