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.''