FSC239Y5 Lecture Notes - Lecture 12: Infrared Photography, Surface Tension, Pattern Recognition
Document Summary
Biochemistry, physics, fluid mechanics, trajectory analysis (ballistics), chemistry: bpa is one piece of a multi disciplined investigation. It is very rarely used by itself for evidence: liquid blood will behave according got the law of physics. Bloodstains and bloodstain patterns are predictable and reproducible. Impact locations: number of impacts, was there movement, sequence of events, objects used, bpa in court is expert evidence, must be relevant to case, absence of excusatory rule. Evidence must be reliable: blood basics, approx. 5 liters in average adult: 55% plasma, slow blood loss is tolerated better than rapid blood loss, 30% blood loss may only result in mild symptoms, viscosity is approx. 4 times more thick than water: surface tension, blood is not affected by age, sex, alcohol/drugs, disease process, bpa classification, three categories. Passive (bloodstains being created or formed by the force of gravity acting alone) Flow pattern (in conjunction with other patterns) Saturation patterns (blood being migrated into different layers of material)
