Blood spatter evidence is messy and may pose difficulties for crime scene investigators and first responders. However, experts trained in bloodstain pattern analysis (BPA) can gather a significant amount of information about the events that produced bloodshed by studying the droplets left behind.
NFSTC recently worked with bloodstain pattern analysis expert John Black, CLPE, CFWE, CSCSA from Ron Smith & Associates to produce a short video demonstrating a specific BPA technique known as stringing. This technique uses geometry, distance and angle to calculate the area of origin for the blood spatter; in other words, where the victim was positioned when blood was shed.
John walked us through the process of examining the scene, setting up references for measurements, determining the individual stains containing the most information, calculating the angle of impact, and finally using the stringing kit to determine where the victim was located when the event took place. In our simulation, the “victim” was a sponge soaked in stage blood that was bludgeoned with a blunt instrument, but the evidence left behind was the same as investigators would find at a crime scene. Check out the video below or visit NFSTC’s YouTube channel at http://www.youtube.com/user/TheNFSTC.