Bloodstain-pattern analysis (BPA) is the analysis of blood stains, used in criminal investigations, providing information based on the size and shape of the stain. The bloodstains are interpreted by analysts to determine the distance and speed the blood traveled, the force used, the type of injury (and whether the blood was from a vein or an artery), the position of the body when the injury occurred, and any subsequent movements. However, this so-called “science” has proved to be problematic in criminal legal spaces.