"Detainers" are requests by immigration officials that local police hold immigrants who are in the U.S. illegally and suspected or accused of a serious crime for 48 hours, or until the immigration authorities can decide if they want to take further action themselves. The Congressional Research Service found in 2015 that local policies vary widely about when to honor detainers, with many honoring those for people held for serious felonies but not for suspects in minor misdemeanor cases. Some require commitments from the federal government to cover the cost of detention or even the locality's legal liability. Demanding compliance with all detainers, some experts say, raises the possibility of federal commandeering of local resources for federal purposes, which happens to be unconstitutional.

Source: Los Angeles Times September 17, 2018 21:56 UTC