Republican officials in several states have taken immigration enforcement into their own hands since President Joe Biden took office, arguing that the federal government is not adequately addressing migrant arrivals at the U.S.-Mexico border. These efforts often duplicate federal enforcement measures and rack up bills for taxpayers with little or no public safety payoff. Florida Gov. Ron DeSantis recently signed legislation requiring every Florida law enforcement agency that operates a county jail to enter into an agreement with Immigration and Customs Enforcement (ICE) under Section 287(g) of the Immigration and Nationality Act. These agreements deputize state or local cops to...