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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.

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.