a sovereign entity to investigate, identify, apprehend, arrest, detain, or transfer to Federal custody aliens in the United States (including the transportation of such aliens across State lines to detention centers), for the purposes of assisting in the enforcement of the immigration laws of the United States in the course of carrying out routine duties. This State authority has never been displaced or preempted by Congress. 3. State authorization for assistance in the enforcement of immigration laws encouraged (a) In general Effective two years after the date of the enactment of this Act, a State, or a political subdivision of a State, that has in effect a statute, policy, or practice that prohibits law enforcement officers of the State, or of a political subdivision of the State, from assisting or cooperating with Federal immigration law enforcement in the course of carrying out the officers’ routine law enforcement duties shall not receive any of the funds that would otherwise be allocated to the State under section 241(i) of the Immigration and Nationality Act ( 8 U.S.C. 1231(i) ). (b) Construction Nothing in this section shall require law enforcement officials from States, or from political subdivisions of States, to report or arrest victims or witnesses of a criminal offense. (c) Reallocation of funds Any funds that are not allocated to a State, or to a political subdivision of a State, due to the failure of the State, or of the political subdivision of the State, to comply with subsection (a) shall be reallocated to States, or to political subdivisions of States, that comply with such subsection. 4. Listing of immigration violators in the National Crime Information Center database (a) Provision of information to the NCIC Not later than 180 days after the date of the enactment of this Act and periodically thereafter as updates may require, the Under Secretary for Border and Transportation Security of the Department of Homeland Security shall provide the National Crime Information Center of the Department