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by guelo 2352 days ago
You might leave DNA everywhere but that does not tie it back to your identity. The secret is who's DNA it is, not the DNA itself. And that's the secret you pay to give to 23andMe when you sign up. Anywhere you leave your DNA can now be tied back to you. Even if you sign up with a fake identity (which is hard since you have to give them a credit card) 23andMe can find the DNA's relatives that are in their database and that can easily lead back to you.