On Thursday, January 24, Revere Police Officer Mike DelloRusso visited Mrs. Mason's CSI class at the Whelan Elementary School.  There he set up a mock crime scene in which a lunch box was stolen and the suspect left a footprint.  Officer DelloRusso cast the footprint using dental stone to make a solid impression.  Students then looked at patterns and grooves in the impression to match the print with the suspect's shoe.  (Photos courtesy of Jamie Flynn)