NCJ Number
172478
Journal
Gazette Volume: 60 Issue: 4 Dated: (April 1998) Pages: 16-21
Date Published
1998
Length
6 pages
Annotation
This article reviews the scientific principles that underlie bloodstain pattern analysis, describes the techniques used, and profiles a training program for bloodstain analysis in which Canadian law enforcement personnel participate.
Abstract
The topics discussed include the history of bloodstain pattern analysis; the formal training required and subsequent understudy program; human blood; the study of physics, with attention to the behavior of fluids; trigonometry; and bloodstain pattern recognition. The model presented demonstrates how an individual bloodstain shows directionality, with a line drawn back toward the initial direction of flight. These lines intersect at the two-dimensional point of convergence. The three- dimensional aspect of the model depicts the impact angles of each bloodstain and the stringed line of trajectory above the two- dimensional lines. This shows the three-dimensional point of origin. One training course currently offered is conducted by Herbert MacDonell. Theory, case study, and experimentation with human blood composes a 40-hour initial course. The second portion of training consists of a 12-month understudy program with an experienced bloodstain pattern analyst. The article notes that the deployment of bloodstain pattern analysts is underused in Canada; it suggests that a small identification unit use an analyst from a neighboring larger police department. 4 references and photographic illustrations