HOUSTON (AP) — U.S. border authorities say they’ve started to increase the biometric data they take from children 13 years old and younger, including fingerprints, despite privacy concerns and government policy intended to restrict what can be collected from migrant youths.

A Border Patrol official said this week that the agency had begun a pilot program to collect the biometrics of children with the permission of the adults accompanying them, though he did not specify where along the border it has been implemented.

The Border Patrol also has a “rapid DNA pilot program” in the works, said Anthony Porvaznik, the chief patrol agent in Yuma, Arizona, in a video interview published by the Epoch Times newspaper.

Spokesmen for the Border Patrol and the Department of Homeland Security did not return several messages from The Associated Press seeking comment on both programs.

The Border Patrol says that in the last year, it’s stopped roughly 3,100 adults and children fraudulently posing as families so they can be released into the U.S. quickly rather than face detention or rapid deportation.

The Department of Homeland Security has also warned of “child recycling,” cases where they say children allowed into the U.S. were smuggled back into Central America to be paired up again with other adults in fake families — something they say is impossible to catch without fingerprints or other biometric data.

“Those are kids that are being rented, for lack of a better word,” Porvaznik said.

But the Border Patrol has not publicly identified anyone arrested in a “child recycling” scheme or released data on how many such schemes have been uncovered. Advocates say they’re worried that in the name of stopping fraud, agents might take personal information from children that could be used against them later.

“Of course child trafficking exists,” said Karla Vargas, an attorney with the Texas Civil Rights Project. But she warned against implementing “a catch-all” policy that could reduce the rights of people who are legally seeking asylum.

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