but whose was it? the medical examiner ordered devon's body to be exhumed for a sample of her bite impressions. >> well, this is the first time that i've ever been asked to secure dental impressions of a deceased victim, especially one who has been exhumed. i had never done it before. and i'm not quite certain if i know of anybody else in my field who has done it before. >> dr. scanlon took a cast of devon's teeth like an orthodontist does when making braces, then scanned the casts into a computer. using a process called hollow volume overlay, dr. scanlon superimposed computer-generated hollow outlines of devon's teeth over a scale photograph of the bite mark on brandon's arm. the outer rim of the bite cast and the outer rim of the bite mark were consistent. police were convinced that the bite wound on brandon's arm was from devon guzman.