? the dallas county institute of forensic sciences, charles lynch discovered the most damaging piece of evidence contradicting darlie s intruder story. on one of the bread knives from the routier s kitchen, linch found a single fiberglass rod and some rubber dust. the cut window screen in the routier garage was made from polycarbide bundles. the interior bundle was found of fiberglass rods. the fiberglass rod found on the kitchen knife was identical to the fiberglass rod from the routier screen. linch could not find any other source of fiberglass inside the routier home that was similar. i was able to eliminate all the sources of fiberglass i could find as being a source.