DC Attorney General Brian Schwalb filed a lawsuit Friday against the Trump administration over its moves to take over the city’s police department and appoint an emergency commissioner, the latest sign of pushback from district officials against the federal takeover.

With federal and local officers on D.C.’s streets, here’s what to know about what law enforcement agencies can legally order you to do — and what they can’t.

Washington, DC, Police Chief Pamela Smith signed an executive order Thursday allowing DC police officers to share information about people not in their custody with federal immigration enforcement agencies such as ICE — as President Donald Trump continues his federal takeover of law enforcement in the nation’s capital and crackdown on illegal immigration.