Federal immigration officers working on the U.S.-Mexico border will start “as early as next week” carrying out rapid DNA tests on immigrants in custody who claim to be related, a Department of Homeland Security official told the Washington Examiner on Wednesday evening.

The official said Immigration and Customs Enforcement will start a trial with the 90-minute DNA tests at unspecified locations on the southern border in an effort to verify familial claims and refer for prosecution adults who try to use an unrelated child to take advantage of U.S. policy.