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Federal immigration officers often use facial recognition technology to identify immigrants in the field. Now, 

 from the Department of Homeland Security outlines plans to give local police working on its behalf the same type of technology.

The document, first reported earlier this month by the tech news outlet 

, is a Privacy Threshold Analysis, which is essentially a federal report assessing whether the privacy implications of a tool warrant further government study.

The tool in question is a mobile app called the ICE Task Force Module, which allows local police to scan the faces of people they stop in their communities.

The app then compares the facial scan against more than 250 million government records. Those include the State Department's Visa records and records from the Traveler Verification Service, used by the Transportation Security Administration at airports to verify identities on international flights.

Once police scan a person's face, the app then instructs an officer either to "not detain or arrest," or it gives the officer a reference code to use to obtain more information from ICE.

The photos captured by the app are then stored in an internal 

DHS declined to provide NPR with more insight about the app and how it is used. In a statement, the agency said ICE is committed to ensuring that the local police who partner with them have the tools needed to support ICE's mass deportation mission.

Those local officers, called "ICE non-federal law enforcement officers" in the document, are likely participants in the federal 287(g) program. A subset of that program, the Task Force Model, gives local police the authority to arrest immigrants on ICE's behalf during their routine police duties. There are 

 participating in the Task Force Model nationwide.

The DHS analysis "raises more questions than I think it answers," says Clare Garvie, deputy director of the Technology Law and Policy Program at New York University School of Law's Policing Project.

For one, the document says the app launched last September, which suggests police are already using it.

It also seems to work similarly to Mobile Fortify, a facial recognition app that ICE and officers with Customs and Border Protection 

, but it's unclear if the new app uses the same technology or something entirely its own.

Garvie says there are also questions about how and when police will deploy the app.

"It's unclear to me whether a pre-existing stop based on some level of suspicion is required before law enforcement can use this app," Garvie says. "Can they walk around taking photos of whoever as sort of a dragnet way to attempt to identify individuals who might be in the country unlawfully?"

 already appears to be happening at the federal level: In places like Minnesota and Maine, community members observing ICE activity reported that federal immigration officers would take photos of their faces and license plates. They said the officers would often know personal information about them, including their names and where they live.

Privacy experts told NPR that allowing local police to conduct similar surveillance could create a chilling effect on freedom of speech, if people begin to worry they'll face repercussions for attending protests, for instance, or for legally observing ICE activity in their communities.

Homeland Security Secretary Markwayne Mullin 

 this month that the agency has used facial recognition technology on protesters, and had been able to identify people who were present at protests in Oregon that were also at the recent protests outside the Delaney Hall Detention Facility in Newark, N.J.

What's more, Garvie says, facial recognition technology is not always accurate, and there have been 

 detained by ICE who were wrongly identified by the technology.

Patrick Eddington, a senior fellow in homeland security and civil liberties at the Cato Institute, a libertarian think tank, says giving police this capability magnifies its potential problems.

"This kind of technology which can impact individual rights, when it's scaled, it can have potentially very, very large effects affecting lots and lots of people," he says. "It's like a Bill of Rights disaster pretty much waiting to happen."

In its statement to NPR, DHS said its law enforcement methods are constitutional.

"Like other law enforcement agencies, ICE employs various forms of technology to investigate criminal activity and support law enforcement efforts while respecting civil liberties and privacy interests," the statement said.

But Eddington says U.S. citizens will get caught up in this surveillance. Officers conducting immigration enforcement, whether they are federal or local, will not know a person's citizenship status before they conduct a scan.

"It is conceivable that a photo taken by an ICE non-federal law enforcement officer using the TFM mobile application could be that of someone other than a removable individual, including U.S. citizens," the DHS document states.

Because every photo taken through the app is kept for 15 years, Eddington says that suggests a long-term government record of citizens and immigrants alike.

The administration has repeatedly denied the existence of a database of protesters, despite instances in which federal agents have told community members observing them that their photo will end up in a database of "domestic terrorists."

However, earlier this month, NPR reported on a 

 sent to members of Congress in which former acting ICE director Todd Lyons indicates the agency gives itself wide latitude to collect information on the people its officers encounter.

"This app wouldn't work if they didn't have databases to pull people's pictures from and compare against," says Cooper Quintin, a senior staff technologist with the Electronic Frontier Foundation, a nonprofit that advocates for digital privacy. "They're playing semantics. They're certainly not being forthright. You know, do they have a database of protesters? Maybe they don't call it that."

He says allowing police to use this technology to do immigration enforcement is a significant expansion of ICE's operations.

"It makes this sort of face surveillance ubiquitous on American streets," Quintin says. "I don't think that Americans should tolerate law enforcement being able to scan anyone's face at any time for any reason to try to determine their identity. This is the new form of 'papers, please.'"

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A document from the Department of Homeland Security outlines plans to issue local police facial recognition technology used by federal immigration agents, a move that will expand the scope of ICE surveillance.

Some local police have access to an ICE facial recognition app

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