Wasn't her son's blood found all over the nightgown she was wearing?
Don't recall testimony that DW's DNA was found anywhere in the VD home..in fact, he was excluded from all.
STill have those pesky unidentified prints in her bedroom and on the doors and the bannister.
Unless he was bleeding or spitting on things how is he going to leave DNA there?
"STill have those pesky unidentified prints in her bedroom and on the doors and the bannister"
As they are in many crime scenes. Big deal.