A policeman pulls over a driver for swerving in and out of lanes on the highway. He tells the guy to blow a breath into a breathalyzer.  "I can't do that, officer." "Why not?" "Because I'm an asthmatic. I could get an asthma attack if I blow into that tube." "Okay, we'll just get a urine sample down at the station." "Can't do that either, officer." "Why not?" "Because I'm a diabetic. I could get low blood sugar if I pee in a cup." "Alright, we could get a blood sample." "Can't do that either, officer." "Why not?" "Because I'm a hemophiliac. If I give blood I could die." "Fine then, just walk this white line." "Can't do that either, officer." "Why not?" "Because I'm drunk."