GUEST of the acid fingers:

James Robert Pitts had his fingerprints surgically removed in, I think, 1941. This was done by having the skin on the tips of his fingers saved down COMPLETELY and replaced with skin grafted from his chest. He was still captured and identified by the ridges on his skin in the next section of his fingers down from his fingertips. Once that happened he was dead: as the only person without fingerprints he was easily identified every time he was picked up.

By the way, acid will scar your fingertips but the scars themselves provide unique identifiers -- and if they eventually go away, guess what genetically determined ridges show up again??? It's been tried, like Pitts' surgery, it's exquisitely painful, and it doesn't work.

Sorry 'bout that. If you want privacy on the Internet or the World Wide Web, don't use either one.