UNITED STATES (AP) – The U.S. government’s DNA testing of migrant families separated at the Southwest border has turned up some surprises.

A Health and Human Services official said Tuesday that in two cases adults who thought they were parents of a child were determined not to be by DNA testing.

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Chris Meekins is helping to direct the court-ordered family reunifications of migrants seeking asylum in the U.S. He says the adults “may not realize they’re not the biological parent.”

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It was unclear how the surprises would be dealt with.

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The government is using DNA testing – done by swabbing inside the cheek – along with documentation such as birth certificates and passports to reunite children with parents.