Have your tried using a gummy bear on your scanner yet? A guy in my class has one of those that he brought in and as long as the authorized user has touched it last (which normally is the case) just push a gummy bear on top and it will read the last oil fingerprint that touched it. So when you leave your desktop wipe that thing off.


Unlike the fingerprint scanners that you slide your finger accross this method with the gummy bear can't work.