A policeman pulled over a driver who'd been weaving in and out of the lanes.
He approached the car window and said, 'Sir, I need you to blow into this breathalyser tube.'

The man reached into his pocket and produced a doctor's note.

On it was written: 'This man suffers from chronic asthma. Do not
make him perform any action that may leave him short of breath.'

The officer said, 'OK then; I need you to come and give a blood
sample.'

The man produced another letter. This one read: 'This man is a
haemophiliac. Please do not cause him to bleed in any way.'

So the police officer said, 'Right, I need a urine sample.'

The man produced a third letter from his pocket. It read, 'This man
plays for the English Cricket Team. Please don't take the piss out
of him.