EveryCRSReport – “Sanctuary” Jurisdictions: Federal, State, and Local Policies and Related Litigation, April 16, 2019.

“There is no official or agreed-upon definition of what constitutes a “sanctuary” jurisdiction, and there has been debate as to whether the term applies to particular states and localities. Moreover, state and local jurisdictions have varied reasons for opting not to cooperate with federal immigration enforcement efforts, including reasons not necessarily motivated by disagreement with federal policies, such as concern about potential civil liability or the costs associated with assisting federal efforts. But traditional sanctuary policies are often described as falling under one of three categories. First, so-called “don’t enforce” policies generally bar state or local police from assisting federal immigration authorities. Second, “don’t ask” policies generally bar certain state or local officials from inquiring into a person’s immigration status. Third, “don’t tell” policies typically restrict information sharing between state or local law enforcement and federal immigration authorities…”