“DNA cannot prove innocence, it can only prove guilt.These men who admitted doing it could have still done it, but just did not leave DNA behind, same as not leaving finger prints.”
It’s pretty hard not to leave DNA behind; even a handshake exchanges DNA. Moreover, the absence of your DNA, and the presence of someone else’s DNA, tends to point rather firmly in the direction of their guilt, and not yours.
Certainly does but still, no DNA is no different than no finger prints, it cannot prove innocence.