State government: federal immigration policy enforcement.

Existing federal law authorizes any authorized immigration officer to issue an immigration detainer that serves to advise another law enforcement agency that the federal department seeks custody of an alien presently in the custody of that agency, for the purpose of arresting and removing the alien. Existing federal law provides that the detainer is a request that the agency advise the department, prior to release of the alien, in order for the department to arrange to assume custody in situations when gaining immediate physical custody is either impracticable or impossible.