PPT-Blood Spatter Pattern Analysis

Ms Schultz The Sam Sheppard Case On July 4 1954 Sam Sheppard called police to report that his wife Marilynn was dead in the bedroom He said the night before his wife had gone upstairs to bed while he was asleep on the couch When he went upstairs he saw his wife covered in blood He heard a noise and ran downstairs chasing after a 63 bushy haired man The two struggled and Dr Sheppard was choked unconscious When police arrived Marilynn was found with 35 wounds to the head and blood drenched the walls door and bed Her face was almost unrecognizable Sheppard served 10 years in prison before the US Supreme court rules that the trial had been tainted The evidence was reexamined Blood spatters and blood drops provided some of the most compelling evidence Dr Paul Kirk an expert in blood analysis determined the killer could not have been Sam because the attack was perpetrated by a left handed person Dr Sheppard was right handed. WARNING. Contains graphic images. Angle of Impact. The acute angle formed between the direction of a blood drop and the plane of the surface it strikes. . Arterial spurting (or gushing) pattern. . Bloodstain pattern(s) resulting from blood exiting the body under pressure from a breached . General Info gained from bloodstain pattern analysis:. 1. the direction the blood originated from. 2.the angle that the blood drop struck a surface. 3. location/position of a bleeding individual at a crime scene. Glass . Blood. Laminated Glass . Laminated Glass is made up of a vinyl laminate (PVB) layer bonded together between two panes of glass under heat and pressure. Laminated glass may crack upon impact, however the glass fragments typically stick to the protective inter-layer rather than falling free and potentially causing injury. It breaks exactly like the windshield of your car, cracks but is held in place by the vinyl laminate layer.. . By : Cyndreka Lindsey. CHEM-4201. 11/20/2014. Outline. Background. Spatter Analysis. Blood Patterns. Common Tests. Writing Assignment. Questions. Background. Before blood analysis detectives had to relay on their instincts and criminal confessions to solve a crime. Blood spatter . 1939—spatter . patterns first . analyzed. Blood may . spatter . when a wound is inflicted. Blood . spatter . pattern—a grouping of blood stains. Patterns help to reconstruct the events surrounding a shooting, stabbing, or beating. Spatter Definition. What is impact spatter?. A blood stain produced when an object makes forceful contact with a source of blood, projecting blood outward from the source.. Why do we care?. Why is impact spatter important?. The success or failure of any criminal investigation often depends on the recognition of physical evidence left at a crime scene and the proper analysis of that evidence.. Crime scenes that involve bloodshed often contain a wealth of information in the form of bloodstains.  The pattern, size, shape, and the location of such stains may be very useful in the reconstruction of the events that occurred. . Griffin. Bloodstain patterns. The patterns left by falling, projected, or smeared blood can help the forensic investigator interpret and reconstruct what has happened at a crime scene.. Observation of the position and shape of stain patterns can give information such as:. Chapter 8. Blood Spatter . #1…it’s not “. splatter. ”! . . Properties of blood affect pattern:. Fairly . high surface . tension (cohesion). Very . viscous. Sticky-adheres . to external . surface (adhesion). Spatter Definition. What is impact spatter?. A blood stain produced when an object makes forceful contact with a source of blood, projecting blood outward from the source.. Why do we care?. Why is impact spatter important?. Bloodstain Science. Warning: Some material in this presentation and related videos may be too graphic for some people. . What . does the abbreviation BPA represent? . Bloodstain Pattern Analysis. What can an investigator learn from the analysis of a blood spatter?. Bits and pieces…. Use of force to describe the blood spatter. In the past, forensic investigators used ‘velocity’ to describe a pattern of blood dispersion. . Low . velocity (gravity/drop, 5ft/s) . October . 14, 2014. Points of origin and convergence. The source of blood spatter can be localized by following the direction of travel of several stains.. Direction of trave. l . The narrow end of an elongated . Blood Stain Evidence. Bloodstain patterns can help investigators reconstruct events in a crime scene.. Analysis of the blood stain can tell whether it is animal or human.. Projected blood stains are called .