This isn't about DNA analysis, it is about staring through a microscope, comparing hairs. Quote:
"At trial, the prosecution relied on the testimony of the three informants as well as the testimony of Elinos Whitlock III, an employee of the Charlotte Mecklenburg Police Department Crime Lab who had been trained by the FBI in how to conduct microscopic hair analysis. He claimed that he could make a “strong identification” that a hair recovered the crime scene was Bridges’s hair. He further stated that there was only a 1 in 1000 chance that two Caucasian people (Bridges is white) would have indistinguishable head hair."