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Local bars and restaurants to collect their dna from anything they might have left behind. >> i would have to flirt with these people. i would get either a cigarette butt or ive gotten their beer bottle. ive gotten their drinking glass. >> using her own money and contributions solicited from her website freeclarence.com, melinda hired a private lab to test these items for dna. unfortunately, none of the samples matched the dna found on her mother. in the meantime, clarence elkins languished in j...

From the crime scene, as far as tread design, tread size, the logo itself. >> investigators noticed the back window of castillons car was broken. pieces of that window were compared to the glass found on the leg of one of the murder victims. the refractive index, a measure of the speed of light as it passes through the glass, was identical in both samples. finally, investigators compared castillons fingerprints to the bloody print found on one victims leg. it matched the middle finger on his rig...

Infrared light causing the molecules to vibrate in unique ways. these can be charted to determine a samples chemical makeup. >> so if its a nylon, its going to show up as a nylon. if its rayon, its going to show up as rayon. if its a acrylic, it will be a totally different pattern. >> samples from the van and from danas clothe were both made from a compound known as nylon 66. to take the comparison one step further, analysts turned to a micro-spectrophotometer. >> that was basically a microscope...

>> she said she was done, and there was something different within nicole that time. >> but simpson apparently wasnt ready to let go. according to kris jenner, he was devastated at being dumped and retaliated by threatening nicole. just weeks before her death, says kris, nicole revealed something shocking. >> things are really bad between o.j. and i, and hes going to kill me and hes going to get away with it. you watch and see what happens. she knew exactly what was going to happen to her. >> an...

The case appeared to have hit a dead end. but police wanted one more thing from randy allen. they wanted to look inside his van. and he readily agreed. there was no coffin-like box in the back of his van like the one dana described. but one thing particularly caught the attention of detectives. >> theres an orange ice chest igloo with the word home depot on it that the lids off of it. inside that ice cooler are dr. peppers. >> dana described seeing is the same kind of ice chest in the abductors ...

A tiny crack, and inside was a minute piece of what looked like foam. >> it was nothing short of a miracle that the tiny piece of foam had stuck in the prop when you consider the dynamic forces going on. >> trace evidence expert ron stanbro analyzed the material under a microscope. >> i did not have very much sample to work with, but it was more than enough for the analysis that we were required to do. >> the foam from the propeller looked very similar to the foam padding from the seat in harry ...

Suspect would have some explaining to do. >> but if rodney berryman was the killer, what happened to the spare tire? when investigators searched further, they found one in berrymans backyard leaning up against the house. they confiscated the tire and greg laskowski made an impression in material similar to the soil at the crime scene. he also took an impression of the side walls. the comparison was remarkably clear. the impressions forming the letters "v," "s" and "d" at the crime scene were ide...

These fibers contained seven. and the colors and the composition were identical in both samples. this meant the blue acrylic fibers on william bucks shirt came from the killers hooded sweatshirt. >> he was wearing either that shirt, or just by pure dumb luck, he was wearing an absolutely identical shirt to that one. >> finally, investigators swabbed around the neck of the sweatshirt and found microscopic skin cells, possibly from sweat. the dna profile of those cells matched bucks genetic profil...

>> they were indistinguishable, one from the other. so, we could conclude from that that they were made up of the same substance, and therefore, they could have common origin. >> but this wasnt conclusive. so, stanbro compared the paint chips from harrys body to the paint on floyds boat. they were heated to 800 degrees centigrade and vaporized so that their chemical components could be measured by a gas chromatograph mass spectrometer. again, the chemical composition of both samples was identica...

Van dusen was pulled from his jeep and shot outside the vehicle. his wife karla was sitting in the passenger seat and was shot through the windshield. but on the steering wheel, investigators found blood which did not come from karla or richard. >> the samples that were tested from the steering wheel were consistent with being human blood. those samples were tested to develop a dna profile. >> perhaps the killer nicked his hand while cutting the seat belt to remove karlas body, and the blood dri...