Wilson said the Georgia Bureau of Investigation which is heading up the investigation into Theresa's disappearance took a DNA sample from Theresa's mother, Claire, who lives in LaFayette. Wilson said the sample was taken shortly after the Friday prayer vigil for Theresa, held downtown on the Walker County courthouse steps.
Wilson believes the sample may be needed to help rule out DNA samples from evidence investigators have collected. So far, Wilson said, he doesn't know of any other DNA taken in the case.
Wilson said now that the GBI has named Sam a "person of interest," the family has the"green light" to go ahead and voice their concern about him.
http://www.foxnews.com/story/0,2933,263367,00.html
It sounds as if they found something of interest in the home that contains dna and they are going to either rule it in or out as belonging to Theresa. The house was described as "immaculate" last week in a few of the reports. Wonder if they used an alternate light source in the home?