presumably laura's hairs. they were all microscopically similar. except one. >> as i was scanning through several of the hairs i recovered from the brush, and all of a sudden one that i looked at, i realized was not a human hair. it was in fact a synthetic fiber. >> the fiber was identified as a strand of artificial hair from a wig. penny told police that her daughter never wore a wig and had never owned one. >> so now that put greater value on this particular piece of evidence. why was a wig fiber in that hair brush sitting on the dresser from her bedroom? >> forensic examiner susan balou also examined bloody pillowcase that was found in the woods. she noticed bloodstains that looked like the impression of a knife, which had been wiped off the pillow case, and another bloodstain on the pillow case was different than the rest.