Bloodstain Pattern Unit News Today

Agent trying to replicate a bloodstain -- >> a nice curving motion like that. >> reporter: -- in an effort to prove the prosecutions case. until they get it right. >> thats a wrap, baby. >> in the bloodstain pattern unit, these agents, a, had no policy for over 20 years to guide them, and, b, they were just running the most bizarre unscientific experiments to try to put people in prison for life. >> thats a wrap, baby. >> reporter: the agent heard in the video, dwayne deaver, the same agent who ...