You do know that there are fake urine kits with drug free pee that people strap on to give their sample!
That’s beside the point. Just the very fact they would have to undergo that testing would be satisfaction enough.
My adult stepdaughter once asked me if she could borrow some pee.
And thorough testing such as presidential security would note the absence of marching DNA material in the sample.
It might be suspicious when the females flop out a fake schlong, or a male sits to give the sample. Or not.