Assemblies are pretty tightly structured. It's almost unheard of to deviate from the program in any way. I've heard a couple of these stories before over the years and went to the trouble of running them down. The ones I checked were simply not true. My favorite was the drunk driver that killed someone and was disfellowshipped on the spot by a committee consisting of the DO, CO, and Assembly Chair.
I happened to know the DO, CO and Assembly Chair, got some real blank looks on that one.