There was some interesting info about contamination of a site by the detectives etc. One thing that was mentioned was "change your gloves often".
It's extrememly possible that transference occurred when the boys saw the nails on the sink and threw them in the basket OR a detective transfered material to the nail. I'd say the odds of transferring OCCURRING are darn good. The kid lives there!!
I thought they took DNA from all the boys and I thought the scratching story was not in the early reports but came up after talking about the nailpolish on the rail.
No, that is the entire point my previous post attempted to make.
They are claiming it was human flesh under the nails, as in ***a piece of flesh that was scratched off of someone's body*** by the AV, supposedly. As for when the scratching story came up, I don't know for sure but I believe it was fairly near the beginning of this mess, maybe not right at the very beginning.
If this is what they are going with, that it was a piece of human flesh that she scratched off a guy and it stuck under the nail, then it can't be refuted simply by saying the nail could have picked up a few cells from material that would normally be in the bathroom wastebasket.