I Know A Guy Who Does Meth And Is Having

I know a guy who does meth and is having surgery tomorrow morning. He has use meth yesterday and today. He shoots it in his arm and swollow it too. How can they put him to sleep and he does meth all the time. Will the Dr. check his blood for drugs before they put him under. He is always doing meth and is twentytwo yrs. of age. I think he could be at risk to be put to sleep tomorrow. He is already at risk because the meth will do him in anyways. He has been in prison and looks like he is headed back.