5 ms·

Naive question, but how much of this information could be gleamed by a nefarious source from an aluminum can you throw away or a piece of hair you drop?

• cjbprime 15y ago
  All of it.
• gwern 15y ago
  Enough to convict you in a court of law - cops do it all the time. (It's not a search requiring a warrant if you throw the cup away, it turns out.)