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What I don't understand is: People use 1Password etc to generate arbitrarily secure passwords for Facebook but agree on sending their DNA password (even though its 1B chars) on a postcard to a company (with unknown security credentials and intentions) just to know that they are 29% east-european and probably sleep better at night. Sigh...

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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