back to with any standards that were found at the scene. >> the charred insulation on these jeans was consistent with the charred insulation found on michael andrade's body. >> the insulation was unique. it was burnt insulation. so, it wasn't a situation where the person could say i'd been working at a construction site, that's how i got this insulation on my clothing. >> wrapped around the spool of the vacuum cleaner, investigators found highly distinctive thread. black polyester fibers were wrapped around cotton fibers, then colored with an unusual combination of dyes. this thread was consistent with thread found around michael's neck. it matched his bed sheet which had been torn and used as a ligature. >> microscopically, it was the pattern that the threads had