In this document, Customs is amending its regulations in response to enactment of the Customs Modernization Act (``The Mod Act''). Among its other provisions, the Mod Act amended Section 596(c) of the Tariff Act of 1930 (19 U.S.C. 1595a(c)) to clarify and codify Customs authority to seize and forfeit merchandise introduced or attempted to be introduced into the United States contrary to law. The Mod Act distinguishes between circumstances under which seizure of such merchandise is mandatory and those in which it is permissive. The amendment follows the legislation and specifies the circumstances under which the mandatory and permissive seizures may take place. The amendment also contains provisions for the detention of merchandise and the remission of articles subject to seizure and forfeiture.