[20200310]LSB10386_移民执法和反征用原则：最近关于州信息共享限制的诉讼 .pdf

CRS Legal Sidebar Prepared for Members and Committees of Congress Legal SidebarLegal Sidebari i Immigration Enforcement & the Anti-Commandeering Doctrine: Recent Litigation on State Information-Sharing Restrictions Updated March 10, 2020 Although the federal government is vested with exclusive power to regulate the entry and removal of non-U.S. nationals (aliens), the impact of immigration is acutely felt in local communities. Some states and local governments have agreed to assist in the enforcement of immigration laws, such as by identifying and apprehending aliens for removal. Others have chosen not to assist in immigration enforcement efforts. In some cases, these states and localities have adopted measuressometimes labeled “sanctuary” laws and policiesthat limit cooperation between state or local law enforcement and federal immigration authorities. For instance, Californias SB-54 generally prohibits law enforcement agencies from using agency money or personnel to investigate, interrogate, detain, detect, or arrest persons for the purpose of immigration enforcement. State laws and policies restricting participation in immigration enforcement have come under scrutiny following t