This video features Matthew Steiner, a certified Senior Crime Scene Analyst, explaining the techniques used in bloodstain pattern analysis. He covers essential safety protocols for crime scenes and demonstrates how various forces and surfaces affect bloodstain patterns, categorizing them into passive, transfer, and spatter stains. The video also explains how to calculate the area of convergence and area of origin for bloodstains to reconstruct events at a crime scene.
The three main categories of bloodstains discussed in the video are:
A wipe pattern occurs when a pre-existing bloodstain has something move through it, altering the original stain. This often shows feathering or evidence of movement through the dried or drying blood.
A swipe pattern, on the other hand, involves blood being on an object that is then moved across a surface, creating a transfer pattern with movement. This results in feathering in the direction of travel, but the original stain is not necessarily present beforehand.
