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>> this case was going to be very difficult to prove to a jury. there was not one single piece of evidence necessarily that totally committed sarah to this crime, and so, we just had to build it piece by piece. >> the piece they thought might prove most significant was the t-shirt and pajama bottoms sarah was wearing on the morning of the murders. >> police when they first approached her saw no blood on her clothing. there was none there, because we luminolled every inch top to bottom, nothing. >> analysts now turned to the pink bathrobe found in the garbage the morning of the murders. family ...

Bottom, nothing. >> analysts now turned to the pink bathrobe found in the garbage the morning of the murders. family members said the robe belonged to sarah. as rod engler examined it with a pro scope, a high-powered microscope capable of 400 times magnification, he was shocked to discover no blood spatter on the front of the robe, but then he looked on the back. he found hundreds of tiny specs of blood, high-velocity blood spatter, the type that would be created by a high-powered rifle. dna testing showed the blood came from both diane and alan johnson. this proved the killer wore the