Prove you can change your DNA first, and then we can talk.
If one of these people commits a crime and leaves behind DNA, what do they think they are going to look for? Their actual sex or how they play dress up?
It would royally screw the ability to identify someone a few years down the road.
I can see it now.
“My brother was a child molester but I haven’t had contact with him in many years. I certainly hope this won’t impact your decision to hire me to tutor your children.”