[Police joke]Nonsense of the drunk joke

A policeman pulls a driver over for swerving in and out of lanes on the highway. He tells the guy to blow into a breathalyzer.

"I can't do that, officer, I'm an asthmatic. I could get an asthma attack if I blow into that tube."

"OK, we'll just get a urine sample down at the station."

"Can't do that either, officer. 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. 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."