Shoe and Tire Impressions in Snow: Photography and Casting

• NCJ Number: 202986
• Journal: Journal of Forensic Identification Volume: 56 Issue: 6 Dated: November/December 2003 Pages: 647-655
• Author(s): Lesley Hammer; James Wolfe
• Date Published: November 2003
• Length: 9 pages
• Publication Format: Article
• Publication Type: Report (Study/Research)
• Language: English
• Country: United States of America
• Note: This paper was presented at the 88th educational conference of the International Association for Identification held in Ottawa, Canada, July 6-11, 2003.

Annotation

This article examines the photographing, coating, and casting of snow impressions to create tangible evidence of criminal activity.

Abstract

Snow makes an effective medium for recording shoe and tire impressions; this article discusses the challenges of preserving such impressions. Following a discussion of the difficulties involved in photographing a white-on-white impression, the article presents a series of suggestions for improving such photographs including using a tripod, using a scale, and employing oblique lighting. Describing the ways in which to prepare a snow impression for casting, the article details the ways in which an impression may be coated with a gray primer in order to create photographic contrast. The article also discusses using snow print wax in slush or wet snow conditions, and lists the materials needed for dental stone and sulfur casting. The authors suggests that dental stone and sulfur casting should be thoroughly practiced before being attempted at a crime scene. 3 Figures, 2 references