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CHE113SER7 - Liquid Blood-Physical properties –viscosity...

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CHE113 Forensic Science Nicolas Canel Forensic Serology Blood Spatter Analysis - Bloodstain Pattern Analysis: the examination of the shapes, locations, and distribution patterns of bloodstains, in order to provide an interpretation of the physical events which gave rise to their origin. - Bloodstain Pattern Analysis can be used to: Confirm or refute assumptions concerning events and their sequence: Position of victim (standing, sitting, lying). Evidence of a struggle. (blood smears, blood trails) Confirm or refute statements made by principals in the case: Are stain patterns on a suspects clothing consistent with his reported actions? Are stain patterns on a victim or at a scene consistent with accounts given by witnesses or the suspect?
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Unformatted text preview: Liquid Blood-Physical properties –viscosity –surface tension –specific gravity-Behaves as a projectile in motion –biology, physics, math Bloodstain Evidence May reveal:-Origin(s) of bloodstain-Distance of bloodstain from target-Direction from which blood impacted-Speed with which blood left its source-Position of victim & assailant-Movement of victim & assailant-Number of blows/shots Surface Tension-Resistance to penetration & separation-Surface acts to reduce surface area-Smallest SA to Volume ratio is offered by sphere Bloodstains-Passive- blood drops-Projected- blood splattered/sprayed -Transfer- bloody hand print smear...
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