the DNA they used came from one of the murder scenes, same DNA used to link the murders together (in the late 90's or early 2000s). It's that same DNA that was fed into the GED database a number of months ago and narrowed it down to one family, they followed that lead to DeAngelo.. to confirm it was infact DeAngelo the first sample they took was off the door handle of his car in a public parking lot, the second match was the day before he was arrested from a tissue in his trash..Btw... am I the only person who just assumed the DNA sample L.E. had in evidence from one of the EAR victims was what was used to link him to the subsequent murders he committed? Oh, sorry... allegedly committed! Sounds like your basic detective work to me. The touch-DNA collected by L.E. from his car door handle in the hobby store parking lot, and from a Kleenex in his trash can in front of his house was just to confirm, right?