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About two years ago I was given my first fingerprint sensor. It was a simple optical sensor and I was supposed to test its quality. Results of my tests were unfavorable. I found out it was easy to log in with the sensor but I had problems to log off. It was necessary to wipe the glass surface after I logged in because otherwise the fingerprint remained on the sensor and repeatedly logged me into the system. So the user had to observe the log-in procedure and always wipe the sensor to remove thedoi:10.6084/m9.figshare.2072317.v1 fatcat:vacbg6ig4zabvm6otw7syooam4