Page 620 - Samples News Today

>> there were more than a dozen cigarette butts. police hoped at least one was from daniel woloson. they gave the evidence to dna analyst jennifer andrew. >> what i gathered from speaking to the investigator in charge, there was a homicide about 20 years ago of a college student, and you know, me being recently out of college, it was a little bit personal for me. >> one by one, andrew cut open the cigarette filters often a good source of dna. >> because thats where all the saliva and skin cells ...

He was originally a suspect. he was working a quarter mile away on the day of the murder. then he ran off when police tried to question him. police found him in michigan where he worked at an auto salvage yard. by this time, he was divorced with one child. and did not want to talk with police. >> woloson told them that he had provided hair samples and fingerprints back in 1981. he was not interested in cooperating with their investigation. >> investigators wanted a dna sample. woloson refused to...

And knowing the story that i knew by that time that she had been murdered, it was something that always held my attention. >> by the year 2000, almost two decades after susans murder, a new dna process called pcr made it possible to test a small biological sample where in the past, much larger samples were needed. >> essentially that process is just xeroxing dna. so were just copying the specific portions of dna that were interested in analyzing. >> so analysts tested the small biological sample...

>> when you handle an item and you leave behind the oils and residues from your skin, that contains skin cells, and we are oftentimes able to get dna from those samples. >> scientists swabbed the inside of the gloves and found dna from only one person. >> sarah was the source of the dna found on the latex glove. >> all the clothing found in the garbage can was then checked for gunshot residue, a gas created by gunfire that can adhere to the shooter. >> we sent the robe, we sent the leather glove...

>> so taking matters into his own hands, brown wrote a letter to barry bench accusing him of murder. >> attention, barry bench, easily get a court order for samples from you for dna testing. after that [ bleep ] thing you did to sabina kulakowski and my false imprisonment i pray you confess your sins as you read this. merry christmas, but dont count on a happy new year. >> brown hoped that bench might reply, and lick the envelope flat in effect, sending his dna sample. instead, bench walked in f...

On the case. >> the majority of the people we looked at early were ex-boyfriends, current boyfriends, co-workers that were very close to the girls, who would have had that type of ongoing relationship. >> then police got a break. dna testing found blood at the crime scene that wasnt from the victims. >> there was an "x" and "y" peak detected for some of the samples, so we knew we were dealing with male blood on the outside of the house. >> it appeared the killer cut himself while stabbing the gi...

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 right hand. >> it was a huge moment. it was the definit...

In both samples. >> 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 sam...

Weeds, burning items. >> was it possible they were trying to remove something connected to karyns murder? to find out, investigators contacted richard monroe, a well-known forensic geologist. concrete and cinders were found with karyns body. could he tell if they came from the slovers car lot? both samples were placed in a scanning electron microscope and hit with high-energy radiation. >> in a vacuum in the sem, the darkness in the chamber, theres no light source. the only light is the x-ray. >...

Most contain three or four color mixtures. 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 about the neck of the sweatshirt and found microscopic skin cells, possibly from sweat. the dna profile o...