>DNA was found in skin particles underneath Greenwood's fingernails.

Were those skin particles dated?
Had she used a toilet that day?
Had her underwear been properly laundered?
Had she exchanged underwear with a friend?
Had she washed her hands that day?

No. Ofcourse I don't want answers to these ridiculous questions, I'm only repeating what is posted elsewhere about skin particles under JonBenet's fingernails.