Another investigator with expertise on forensic issues, who spoke only on the condition of anonymity, confirmed the theory that the underwear DNA might be the result of point-of-production contamination.

And, wherever it came from, that investigator said, "We certainly don't think it is attributable to an assailant. That's our belief. When you take everything else in total, it doesn't make sense. I've always said this is not a DNA case. It's not hinging on DNA evidence."
Excerpted from RMN.

When you take everything else in total translates to "based on the brainwashing I've already had from the BPD, I started off thinking it was not attributable to an assailant and now I still think the same garbage that I started out thinking.