The problem with fingerprints is false negatives. My wife has very hard to read prints--to the point that someone doing it said she would be the perfect criminal because she wouldn't leave prints. Admittedly, the technology might have improved since.
gloves don't leave fingerprints either. couldn't a perfect criminal just wear gloves? and many criminals are still caught even without fingerprints; e.g., the assassin of that healthcare CEO.
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