A man leaves a bar, gets into his car and drives away. A mile down the road, he's stopped by a police officer.
The officer walked up to the driver's side window holding a Breathalyzer and said, "Good evening sir. We're testing for drunk driving. Would you please blow into this machine?"
The man replied, "I'm sorry, I can't do that. I have asthma. If I blow in that machine, I will get out of air".
"In that case, I'm going to have to ask you to come back to the station for a blood test."
The man said, "I can't do that. I have anemia and if you stick a needle in me I will bleed to death.".
The officer said, "Then you'll have to get out and walk 5 yards along this white line."
"Can't do that either," said the man.
The officer was getting irritated. "And why not?"
"Because I'm dead drunk."