DNA Tests for Organ Recipients - Health Street DNA tests confirming identity or immediate family relationships are 99.9% accurate, so when Chicago-based Holly Becker got her results from a consumer ancestry DNA testing company in 2019, she could not imagine why the test identified her as someone else. While consumer DNA tests have been revealed to be a scam when it comes to their ability to reveal the ancestry of a person, even these tests rarely attribute the DNA of one person to another person.