I am not 100% sure, but I think its not legal to arrest him for misdemeanors while the legislators are in session. Only violent crimes and/or serious cases like treason. When the session is over it is fair game, and the charges could be post poned until then. I guess the idea is to not allow someone to arrest a senator etc during session to interrupt votes and stall any bills. I believe most if not all states have some sort of law like that.
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