[citation][nom]hairystuff[/nom]I had an interesting experience with a Compaq fingerprint reader, once you have used your finger on the scanner window and if your print wasn't smudged post scanning, then if condensation occured on the scanner window it would auto log you on once there was enough moisture on the scanner windows to generate a fake fingerprint.[/citation]
Logged in on a similar system once with a sheet of plastic, it detected the pressure and scanned the smudge and granted access. Awesome security!