To answer you questions...No never leave firearms in the vehicle. Second, yes you should tell the officer before you just start removing firearms from a vehicle. Third, Someone stated that you only have to notify if you carry pursuant to CCW, this is correct however, it would be a very courteous and smart action to inform anyway. Next, yes there is a protocol for safe keeping of an unconscious persons weapon. Fifth, Don't leave weapons in the vehicle, Sixth, Don't ever, leave unattended weapons in the vehicle.