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Immediately retrieved the spoon from the trash. >> the technology has become incredibly sensitive and incredibly powerful. and there is the ability to obtain dna from the smallest piece of evidence in a very reproducible, very reliable manner. >> on the spoon, scientists found saliva. they extracted dna and compared to it the blood found on the steering wheel of the van dusens' jeep. the results left no doubt. >> the dna profile that was developed from the steering wheel was matched to the dna profile that was obtained for william deparvine, his known standard. >> william deparvine? >> william...

Weapon that investigators had been looking for. >> one was inoperable. the other 9 millimeter handgun was test-fired into a tank of water. that bullet was microscopically compared to the 9 millimeter slug found in the van dusens' jeep. analyst erica henderson carefully examined the distinctive marks called lands and grooves made when each bullet goes through the barrel of the gun. >> when you look down the barrel of a firearm, you will see the ridges and valleys. these ridges and valleys, once a bullet is fired, will be imported on the bullet. so the bullet will also have these ridges and vall...

Been looking for. >> one was inoperable. the other 9 millimeter handgun was test-fired into a tank of water. that bullet was microscopically compared to the 9 millimeter slug found in the van dusens' jeep. analyst erica henderson carefully examined the distinctive marks called lands and grooves made when each bullet goes through the barrel of the gun. >> when you look down the barrel of a firearm, you will see the ridges and valleys. these ridges and valleys, once a bullet is fired, will be imported on the bullet. so the bullet will also have these ridges and valleys. >> the test bullet and th...

Crime scene analysts then turned their attention to the van dusens' classic red pickup truck found behind henry sullivan's apartment. as they examined the vehicle, there was another bizarre incident in this already unusual investigation. >> we are approached by a white male subject who identifies himself as william deparvine who announces himself to us as the owner of the truck and said that he had purchased it the day previously. >> deparvine lived in the same apartment building as henry sullivan, and he said he bought the truck from the van dusens just the day before. he said the van dusens ...

In fact, i just lost one a couple of weeks before you came to interview me. >> the driver's license was dusted for fingerprints. none were found. police also looked for fingerprints inside the van dusens' jeep, especially on the seat belt. >> after having applied ninhydrin to the seat belt and allowing it to dry completely, i reexamined the seat belt for the presence of fingerprints and found none. >> but the killer left behind one piece of evidence. a 9 millimeter bullet found on the floor of the victim's jeep. when investigators searched henry sullivan's apartment, they found a 9 millimeter ...