28 CFR 2.30: False information or new criminal conduct: Discovery after release.

If evidence comes to the attention of the Commission after a prisoner's release that such prisoner has willfully provided false information or misrepresented information deemed significant to his application for parole or has engaged in any criminal conduct during the current sentence prior to the delivery of the parole certificate, the Regional Commissioner may reopen the case pursuant to the procedures of § 2.28(f) and order the prisoner summoned or retaken for hearing pursuant to the procedures of §§ 2.49 and 2.50, as applicable, to determine whether the order of parole should be cancelled.