Wisconsin Department of Justice Identification Manual - Imprimus ...

Rolling a finger on a glass platen
To obtain "plain" impressions, all the fingers of the right hand should be pressed
simultaneously upon the platen. The left hand should be similarly printed, and the
thumbs of both hands should be pressed on the platen without rolling. The "plain" or
"simultaneous" impressions are used as a check upon the sequence and accuracy of
the rolled impressions.
Plain impression on a glass platen
Wisconsin Department of Justice Identification Manual Obtaining Fingerprint Impressions • 73