Sanctuary jurisdictions typically have regulations that limit cooperation with ICE, impacting the enforcement of immigration laws. These measures may include refusing ICE detainers, restricting agency interactions with ICE, or hindering the sharing of information about incarcerated aliens.
ICE uses detainers as a key mechanism to detain aliens involved in criminal activities, ensuring their custody transfer for deportation. These detainers provide details about the individual’s criminal and immigration history, highlighting their public safety or security risk.