Bars the District of Columbia from having any law, rule, policy, or practice that prevents District officials from sharing, receiving, retaining, or exchanging information about a person’s citizenship or immigration status or from complying with lawful Department of Homeland Security (DHS) requests for detainers or release notifications. The only permitted exception is a policy that refuses to share such information or comply with a DHS detainer request for a person who comes forward as a victim or witness to a crime. The provision cites DHS requests under INA sections 236 or 287.