The proposed bill, known as the Anti-Sanctuary Act, mandates that law enforcement agencies in New Hampshire comply with immigration detainers for inmates when it is safe to do so, while also prohibiting state and local entities from enacting sanctuary policies that would obstruct the enforcement of federal immigration laws. Specifically, the bill prohibits law enforcement from investigating an inmate's citizenship status unless it follows an alleged violation of state law or is authorized by law. Additionally, it disallows blanket policies against compliance with immigration detainers and restricts any government entity from limiting the transmission of inmate immigration information.

The bill also outlines definitions for key terms such as "federal immigration agency," "immigration detainer," and "sanctuary policy," and establishes penalties for violations of its provisions. Notably, it includes exceptions for certain witnesses or victims of crimes, ensuring that individuals who may be unlawfully present in the U.S. and have been victims of serious crimes are not subjected to immigration detainers unless specific conditions are met. The act is set to take effect on January 1, 2026.