under a microscope, laskowski saw the highly distinctive marks from the tool used to cut these links.> i'm looking for striations that run across the length of the cut surfaces. >> the striations on each tool are different. they're created when the tool is made and by normal wear and tear. laskowski compared the striations on the links from rodney berryman's truck to the links on the jewelry found with florence hildreth's body. at 50 times magnification, the results were clear. >> i have links from the victim's body. they have markings on them that are of the same type, made by the same tool that made the markings that made up the necklace. it certainly indicates that the 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 berryman's 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.