If I recall from the first DNA press conference, close the end a reporter asked if there was any DNA found in/on the AV. Mind you this is my recollection, I have most of the other stuff TIVO'd, but this one I don't. I think it was Cheshire who said something to the effect of "we don't know, we haven't seen the complete report yet".. I thought it odd at the time that there was no real follow-up to that. Could have been one of those "last question" moments.
I'll try to find the transcript or video of that meeting and re-listen.
Video of the first DNA defense press conterence:
http://www.wral.com/news/8600601/detail.html