CNN Forensic Files February 12, 2014 07:16:00
Darrell north's murder was so violent that forensic tests were needed to make sense of what happened. >> we had numerous types of blood stains. they included passive blood drops. we had smears, transfers, and frankly there was so much blood that you would be hard pressed to try to classify some of it as to how it got there. >> we took many samples. we took 23 samples of blood from various different parts of that crime scene. >> they first had to determine if all the blood had come from darrell north. >> when the assailant is