The Mind of a Supercriminal

So I was thinking this morning: criminals often get caught because their hair or some other DNA-laden material is found in the crime scene. (At least on TV.) What if a criminal purposefully loaded the scene with lots of other people's genetic material? Hair from the barbershop, boogers from under chairs, flakes of skin from old razors--the ultimate criminal wouldn't be an ultra-clean person wearing surgical gloves; they would be a mess of material incriminating anyone but themselves.