FSC239Y5 Lecture Notes - Combined Dna Index System, Gunshot Residue, Personal Protective Equipment
Document Summary
Physical evidence: material items (non-living origin, biological evidence comes from living) Link suspect to the scene/victim (trace evidence) Key elements of a crime (who, what) Repeated behavior (way that crime was committed) Recognition or identification of cs (boundaries), inner and outer perimeters. Documentation of cs (all police officers will be writing notes, signing people in and out) Identify witnesses: police tape, scene security officer, cs security log (contamination) Note transient (temp. evidence) or conditional evidence (winder, lights etc. ) and weather conditions. Hand swabs (gunshot residue: impression evidence, forensic biology, trace, firearms, documents (forgeries, cheques, in fraud cases) Transient: odor, temperature, imprints and indents (collected immediately. Pattern: forcible direct contact blood spatter, glass fracture, burn, tire, powder residue, clothing and body position. Conditional: produced by a event or action, light, fire (color, direction, speed and temp). Locard"s law (exchange principle): every contact leaves a trace. Protection: personal protective equipment (ppe, change gloves and forceps after each item (avoid across contamintation)
