@dezztroy: Yes, if you took the picture and blame David he gets put on leave.
I blamed Jefferson because I had already told the principal about Nathan's gun and Jefferson about the photo of David and Kate. Also, when you blame Jefferson after telling him about the photo, Jefferson tells the principal about the photo. Basically, my goal is to tell as many people about the dirt I have so I can say I told you so in the end.
Couldn't save Kate though. :/