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Unless you go to extraordinary effort to keep your DNA confined, you almost certainly leave samples in publicly accessible places hundreds of times a year.

It's not a question to keep my DNA confined, but rather making it random. If somebody wants to track my DNA, yes they can do that - here in Switzerland, far away - but I wont send it to them on a silver plate.

There's a difference between leaving a door unlocked vs. mailing a stranger the key.

How long do those samples last?

DNA lasts a long time. Just watch any one hour crime drama. :)

Actually, it could last an arbitrarily long time if it wasn't exposed to UV or cleaned up. The hard part would be distinguishing your random DNA from that of everyone else.

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