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>> investigators found no evidence that judy bruce and james isaac were anything more than acquaintances. next, investigators asked dick bisbing, senior research microscopist at mccrow & associates, to analyze the dirt on the bottom of larry bruce's shoes which were still in evidence. to do this, bisbing used a polarized light microscope. >> it's like looking through polarized sunglasses. and by manipulating the light, we can see different optical properties, different optical features of each of these mineral grains. their appearance, their color, their optical properties all help us identify...

Next, investigators asked dick bisbing, senior research microscopist at mccrone associates, to analyze the dirt on the bottom of larry bruce's shoes, which were still in evidence. to do this, bisbing used a polarized light microscope. >> it's like looking through polarized sunglasses. and by manipulating the light, we can see different optical properties, different optical features of each of these mineral grains. their appearance, their color, their optical properties all help us identify the type of mineral. >> the dirt on larry's shoes did not match the samples of dirt around judy's body. b...

James isaac were anything more than acquaintances. next, investigators asked dick bisbing, senior researcher at mccrone associates, to analyze the dirt on the bottom of larry bruce's shoes which were still in evidence. to do this, bisbing used a polarized light microscope. >> it's like looking through polarized sunglasses and by manipulating the light we can see different optical properties, different optical features of each of these mineral grains. their appearance, their color, their optical properties all help us identify the type of mineral. >> the dirt on larry's shoes did not match the ...

On the electric blanket remains unidentified. >> investigators found no evidence that judy bruce and james isaac were anything more than acquaintances. next, investigators asked dick bisbing, senior researcher at mccrone associates, to analyze the dirt on the bottom of larry bruce's shoes which were still in evidence. to do this, bisbing used a polarized light microscope. >> it's like looking through polarized sunglasses and by manipulating the light we can see different optical properties, different optical features of each of these mineral grains. their appearance, their color, their optical...

Dna analysis, which didn't exist in 1978, determined that they were semen. one stain matched larry bruce's dna, judy's husband. the other did not. when judy was murdered, larry claimed judy was having an affair with a co-worker, james isaac, who died in a suspicious traffic accident days after judy's death. to see if it was isaac's dna on the bedding, investigators obtained a court order allowing them to exhume james isaac's body. >> when the dna profile from isaac was compared with the unidentified semen on the electric blanket, it was found to be not a match so the semen on the electric blan...