I think the only thing worse than this type of scenario is the person who isnt drunk/drugged and gets agressive while you are already seeing to a patient in the back of your ambulance. but as you have inconvenienced them by doing your job they are going to tell you so. and then get agressive with you too. You cannot restrain them for their own good, as they are not your patient - they cannot be thrown off your ambulance as they don't want to be on it - or have anything to do with it in the first place. they are just being a nasty git - they dont pay enough to put up with that.