The police officer, thinking he had a good plan, parked his squad car across the street from the local bar.
He kept an eye on the people coming out of the bar for several hours and much to his delight saw a man staggering out of the bar door about ten minutes before closing time.
The man weaved back and forth as he walked across the parking lot, falling down several times before he got to his car.
Once at the car, he dropped the keys twice before he finally got the car door open.
Once inside, he started the car and drove slowly thru the parking lot to the street, hung a hard right and started down the road, weaving slightly.
The officer chuckled, started his car, turned on his headlights and flipped on the flashing red lights and proceeded to follow the man.
A half mile down the road the driver pulled over to the side of the road and the officer approached his car.
"Out of the car, buddy. Your going to have to take the drunk driver test."
The officer proceeded to tell him to walk in a straight line, put his finger to his nose with his eyes shut and half a dozen other tasks that measure dexterity.
The man passed each test with flying colors.
The officer then had him breath into a balloon and tested his breath for alcohol.
The test showed the man to be totally sober.
"OK, buddy. What the hell is going on here?" said the officer.
"Well, you see, when I got to the bar, I drew the short straw so I didn't drink a drop.
Just before closing time, I left and drove to this spot.
You see officer, tonight, I was the decoy.