Immigration Detainers After Gonzalez v. United States Immigration & Customs Enf’t, 975 F.3d 788, 818 (9th Cir. 2020)

An emerging and complex area of constitutional law involves local governments coordinating with the United States Immigration and Customs Enforcement (ICE) by recognizing ICE’s immigration detainers. An immigration detainer essentially requests that a law enforcement agency continue to temporarily detain a person in order for ICE to assume custody and start removal proceedings.¹