for detective jim wallace it was something buried in a routine crime lab report. and hung up to dry tested negative for blood. this time the lab report noted something else found on those pants which caught the eye of detective wallace. dirt. >> if you're washing these pans, what is the point of washing pants? aren't you trying to wash the dirt out? in this case the dirt was still present instead it was looming all going into areas. >> the chemical policed used to detect blood in body fluids, but this did not make sense. with no blood on the pence delusional was still highlighting something else on two specific areas of the pants. >> on each side, write about of the area of the knee and the front of the pants. >> if you're kneeling doubt in something. >> if you're kneeling down on something that you want to get out and clean with some detergent. he did successfully get it out. this would glow exactly as we saw. it would glow because, cleaning detergents will also make luminol glow. you think you have blood but you just have cleaning detergents. >> the pants that h