No, do this. Change the Jones' law to say:
"Killing the captain's pet is not punishable OOCly, unless you are an MP and are on orders to not kill Jones. In addition to this, killing Jones cannot be punished ICly other than a charge of hooliganism. However, the captain reserves the right to battlefield execute anyone who harms, kidnaps, kills, or disrupts Jones in any way."
So I can set it in brig and watch through my office cams then BE whoever kills Jones.