NCJ Number
80995
Journal
FBI Law Enforcement Bulletin Volume: 51 Issue: 1 Dated: (January 1982) Pages: 8-11
Date Published
1982
Length
4 pages
Annotation
A standard, simple, and accurate method of reproducing a bite mark pattern is presented for use in the analysis of evidence and in courtroom presentations.
Abstract
Both prosecutors and defenders are using bite mark evidence with increasing frequency. Bite mark evidence is a true scientific analysis of the wound, not just a comparison between the inflictor's teeth and the marks in the skin. The value of bite mark comparison and the use of a bite mold was demonstrated in the case of People v. Walter E. Marx in 1975, when the bite mark evidence helped the State obtain a first degree murder conviction. Materials needed for obtaining a bite mark impression from skin include (1) a light-bodied permlastic base and catalyst, (2) a spatula, (3) a paper mixing pad, (4) a rubber base syringe, (5) a 3-inch by 3-inch square of gauze, and (6) a dental dye stone. Eight steps are involved in obtaining the bite mark impression, starting with the mixing of the permlastic base and catalyst using the spatula and continuing with applying the mixture to the bite mark indentations in the skin using the rubber base syringe. Gauze is applied over the area covered by the mixture, which is allowed to harden for about 5 minutes. Dental dye is mixed with a small amount of water and placed on top of the gauze surface. After 5 minutes, the mold is gently removed. It should be stored at room temperature. Photographs and drawings are provided to illustrate the technique.