Crime Scene Reconstruction: Bloodstain Pattern Analysis: BPA
A couple are viciously attacked, and one person survives. She identifies the killer but later retracts her statement, so the investigators rely on DNA found on an unlikely source to solve the crime. TMBA was asked to recreate this crime scene for tru TV's television program "Forensic Files".
Relying on expert testimony, blood spatter analysis, and calculated bullet trajectories- TMBA provided this crime scene recreation. These animations illustrate that the victim was kneeling at the time of death, which contradicted eyewitness accounts.
About six quarts of blood is pumped throughout the entire vasculature in the body of an adult. When that circulation is interrupted by trauma-from bullets, a blunt object, or a knife-some of that blood is spilled. In the event of a violent confrontation or a shooting, that blood is usually spurted forth in scattered drops, or spattered.
The positions of the blood stains or the patterns of the blood spatter tell a meaningful story to a crime scene investigator. From the number and the location of the stains, it is possible to ascertain the movements of the victim with respect to his attacker. From blood spatter analysis, it is also possible to determine the direction from which the attack came.
The proximity of the bloodstain to the victim can indicate the kind of impact the victim received, the kind of object that created his wounds, the number of strokes that were inflicted, and the location of the victim and the offender during and after the crime was perpetrated. (http://en.wikipedia.org/wiki/Bloodstain_pattern_analysis)
