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Starting Monday, CBP will collect swabs from people apprehended by the U.S. Border Patrol at the Canadian border in or near Detroit, as well as people detained at the official port of entry at Eagle Pass, Texas, across from Piedras Negras, Mexico. CBP said its pilot program will last 90 days. In Detroit, people as young as 14 will be subject to DNA collection.

The memo said agents will not take DNA from people entering the country legally or being held for further screening without being placed into detention.

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U.S. Immigration and Customs Enforcement, which is currently holding more than 40,000 people in medium- or long-term detention, will designate one of its jails for pilot testing. Both ICE and CBP will eventually expand their data collection nationally, according to the memo.