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Sent to forensic analyst mary wong. she conducted the same tests she used on the hooded sweatshirt. no gunshot residue was found on either man's clothing. so the hooded sweatshirt and the shirts from both men were sent to skip palenik, one of the country's premier experts in trace evidence analysis. >> in terms of physical evidence, microscopic evidence, this was the only evidence available. and so it assumed great importance in the case as the investigation proceeded. >> his job was to determine which man was wearing the sweatshirt. >> whenever two objects come into contact, there's always a ...

Discovered that the sweatshirt was made up entirely of acrylic fibers. palenik could find no acrylic fibers on vincent holmes' shirt, but he did find some on william buck's shirt. but were these fibers from the sweatshirt? most clothing isn't dyed with just one color. usually it takes a combination of colored dyes to get just the right shade. to identify the chemical makeup of the blue fibers, palenik placed them on a plate of silica gel and dipped them into a solvent. >> the solvent mixture travels its way up the plate. it starts to separate the dyes into individual components. sort of a grat...

>> under a microscope palenik discovered that the shirt was made up entirely of acrylic fibers. palenik could find no acrylic fibers on holmes' shirt, but he did on william buck's shirt. but were these fibers from the sweatshirt? most clothing isn't dyed with just one color. usually, it takes a combination of colored dyes to get just the right shade. to identify the chemical makeup of the blue fibers, palenik placed them on a plate of silica gel and dipped them into a solvent. >> the solvent mixture travels its way up the plate. it starts to separate the dyes into usual components. sort of a g...