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What kind of system is that? >> while duckett's appeal was severely weakened without gurley's recanted testimony, beth wells was still able to attack the prosecution's case, starting with the tire tracks found near teresa's body. >> the little dirt road had the tire tracks by it, which was a pretty good find by the detective. they preserved the tracks, did a mold of it, everything else. sure enough the tire tracks had the same tread pattern that the police cars had. but just because somebody had the tire tread with the same basic pattern doesn't mean it was that car. >> duckett's former boss, ...

Next, steve derek wanted to see if the black plastic pieces from the crime scene came from this iron. >> so that point became a puzzle. after everything was photographically documented, started gluing the plastic pieces back together. >> after some trial and error, derek discovered the pieces fit perfectly. >> the pieces from the crime scene and the iron created a link to whipple be being at the crime scene. >> investigators also analyzed the athletic shoes found in whipple's possession. they were size 11, the same size as the shoe impressions found in blood at the crime scene. steve derek use...

Then the fluorescent powder that you use to dust up the impression is very bright and so it makes a very good contrast. >> it was successful. tey saw one clear print, the heel portion of the killer's left shoe. it appeared to be an athletic shoe. >> most of the prints you see are partial prints. you may sometimes get some full footwear impressions, but with people walking over on top of them, it can destroy the prints and many times you only get partial prints. >> back in the forensics lab, scientists saw what looked to be another shoe impression on a shard of broken glass. so, they placed it ...

The size and tread pattern were the same. more importantly, the wear patterns known as accidental characteristics were virtually identical. >> the right shoe that had been taken from whipple was the shoe to the exclusion of all others. >> derek also concluded this was the shoe which made the bloody impression on heather's shirt. >> the outsole design of whipple's shoes matched this bloody impression on the tee shirt. >> and tests showed that clothing in the car contained heather's blood. his very first interview with police james whipple confessed. >> i did it because of dam crack cocaine. you...