Establishes provisions limiting state and federal collaboration for purposes of immigration enforcement operations. Requires state and county law enforcement agencies to establish and publicly post written policies regarding civil immigration enforcement. Prohibits law enforcement officers from initiating or prolonging a stop, detention, or arrest of a person for the purpose of determining the person's civil immigration status, except under certain circumstances. Prohibits state and county involvement in civil immigration enforcement activity in certain locations. Requires the Department of Law Enforcement to assist state and county agencies in maintaining compliance with the civil immigration enforcement policy. Effective 7/1/3000. (HD2)