A police officer is watching a bar that is known for causing a lot of driving after having a little too much to drink.
At closing time he sees a guy fall off his bar stool, stumble towards the door, trip a few more times outside and try his keys in five different cars before he finds his own. Once inside it takes him forever to get the keys in again.
Most of the other guests of the bar are now leaving, but the cop knows that the breath test with this guy will be a certain positive, and get him some kudos back at the station, so he waits for his prey.
Finally the guy starts his engine and drives away. Immediately the policeman pulls him over and starts reading him his rights while he gets the man to do a breathalyser test.
The result of this however is a highly disappointing zero. The policeman thinks the machine may be broken and gets him to take another one; same result.
Now he gets annoyed and shouts: “What on earth are you, some freak of nature?”
The driver replies ..........
“Nope, tonight I’m the designated decoy.”
