It's in the OP. The DNA came from tissue on one of the stick-on nails found in the bathroom trashcan.
And, I'll bet the AV put the stick-on nails in the bathroom trashcan when she was putting on nail polish.
There is so much to discuss in this morning's flurry of articles my head is reeling. While the potential DNA "match" could have dominated the news, the injustice of Nifong charging the poor cabbie is something so outrageous that media attention will hopefully be focused there. Nifong is a human tornado leaving wreckage in his wake with no clue where/who he will strike next.