Maryland Attorney General Anthony Brown issued guidance to local police departments Wednesday reminding them that they are still bound by state law when working with federal agencies, and are limited in what they can do in such partnerships.

The 11-page document lists what local police “must do, may do and must not do” in a range of interactions with federal authorities, from simple backup to formal joint task force agreements. But it includes specific language on what local officers can and can’t do when it comes to immigration enforcement.

Among other limits, the guidance says Maryland officers may not ask a suspect’s immigration status, or extend a suspect’s detention to determine their immigration status; must identify themselves by name and badge number, and cite a reason when m

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