This is really late, but I just now watched A Little Murder and wanted to see if this existed, which it obviously does. So...this is great, points out a lot of good examples in canon why it may have happened. It is also well organized.
One thing though, when you mentioned that Warrick couldn't touch Catherine in A Little Murder after the attack....it wasn't because she fell near the victim, it was because she was now evidence because hairs, fibers, or skin from the suspect could have gotten on her during the attack.