by Rafael Carranza, Arizona Luminaria, and Gabriel Sandoval, ProPublica

This article was produced for ProPublica’s Local Reporting Network in partnership with Arizona Luminaria. Sign up for Dispatches to get our stories in your inbox every week.

Since the start of President Donald Trump’s second term, U.S. immigration officials have deputized a record number of local police to function as deportation agents, despite repeated warnings from government watchdogs since 2018 that the program does not adequately train and oversee officers.

This expansion of the 287(g) Program is being driven by the administration’s resurrection of a previously abandoned task force model empowering local officers to question individuals’ immigration status during traffic stops and other routine policing. At least 315 departments have signed on to the more aggressive approach, which Immigration and Customs Enforcement abandoned in 2012 amid racial profiling problems and lawsuits.

Overall, ICE initiated 514 new agreements with local law enforcement agencies across 40 states since January. Among the new partners are highway patrol troopers in Tennessee and officers with about 20 Florida agencies, who in recent weeks assisted ICE with the arrest of more than 1,300 people.

“It has been wonderful to see people jump in and be a part of it to make sure that we have not just the authorities that we need to go out there and to work, but also to have the local knowledge and the people in the community that really want to be a part of the solution,” Department of Homeland Security Secretary Kristi Noem said in a statement.

ICE officials tout the expansion of the 287(g) Program — named for the section of law that allows the delegation of limited powers to local officers — as a “force multiplier” to accelerate deportations and counter sanctuary policies that limit local cooperation with immigration agents.

But civil liberties experts and immigrant advocates warn such agreements come at a high cost to communities. Bringing on local partners at such a fast pace compounds the concerns, voiced by ICE’s own internal watchdog, that the agency is unable to adequately train and supervise local officers to execute often complex immigration laws. Advocates say police are more likely to engage in racial profiling under these agreements, damaging community trust in local law enforcement.

“Local law enforcement in these jurisdictions have more authority to enforce immigration laws, but they don’t necessarily know just by looking at someone walking down the street or pulling someone over whether they’re an immigrant or not,” said Austin Kocher, a professor at Syracuse University who has tracked the 287(g) Program for 15 years. “There are a lot of people in this country who are going to be affected by this expanded police power, maybe even who aren’t immigrants, but who might get caught up in the system just because police think they’re an immigrant or because they’re conducting enforcement operations in places that affect U.S. citizens.”

As of June 6, local and state police departments had signed 649 agreements to participate in the program, compared to the 135 agreements that were in place in January, according to ICE. An additional 79 applications were pending. A local police or sheriff’s department may have multiple agreements with ICE.

Over several days last month, the Tennessee Highway Patrol sent a surge of cruisers along the streets of south........

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