Good point. But what about junk mail (paper) with my name on it, that I collect w/ my hands via USPS, and discard in recycling? A plastic bottle of prescribed meds w/ my name on it that goes into recycling. Couldn't they match DNA/prints to that, and then something like a beer can or water bottle with same prints and add'l dna?

(Note: not arguing with you here as your point is 100% valid, just theorizing)