often is the key to solving crime. and they find this gun case. >> to see if the case contained any fingerprints, forensic analyst mike riddle used super glue fuming. a process where the chemicals from heated super glue adhere to finger oils. riddle saw what he thought might be some partial prints and used yellow dye to enhance the image. these partial prints were in an unusual location. >> they were in one of the corners in a curved portion of the gun case partially covered by the foam rubber that was in there. had i never moved the foam rubber, i probably would not have been able to develop these prints using super glue. >> the prints belonged to mark wu. and on the sandals from the garbage dumpster, scientists found tiny mist-like droplets of