FSC239Y5 Lecture Notes - Lecture 8: Digital Evidence, Blood Residue, Forensic Pathology
Document Summary
Bpa is an applied science other physical evidence biochemistry physics fluid mechanics trajectory analysis (ballistics) chemistry one piece of a multi disciplined investigation. Hans gross coined criminalistics : scientific study of crime described importance of blood marks/traces. Herb macdonell determined relationship between length/width ratio of bloodstain and impact angle provided bpa evidence in sam sheppard homicide case flight characteristics and stain patterns of human bloodstain. International association for identification accepts bpa as forensic discipline. Scientific working group on bloodstain pattern analysis. Bpa in canada acceptance in court with some limits relevant to case qualified expert. 55% plasma, 45% blood cells/platelets person can tolerate 15% blood loss w/o symptoms slow blood loss is better than rapid. 4 times more viscous than water outside of body high surface tension, elastic outside of body. Most efficient shape is a sphere blood patterns not affected by age, sex, disease, or alcohol/drugs produces patterns that are predictable and repeatable.