One night a police officer was staking out a particularly rowdy bar for possible DUI violations.©OFFICEJOKES.NET

At closing time, he saw a fellow tumble out of the bar, trip on the curb, and try his keys in five different cars before he found his.©OFFICEJOKES.NET

Then he sat in the front seat fumbling around with his keys for several minutes. Everyone else left the bar and drove off.©OFFICEJOKES.NET

Finally he started his engine and began to pull away. The police officer was waiting for him.©OFFICEJOKES.NET

He stopped the driver, read him his rights and administered the Breathalyzer test.©OFFICEJOKES.NET

The results showed a reading of 0.0.©OFFICEJOKES.NET

The puzzled officer demanded to know how that could be.©OFFICEJOKES.NET

The driver replied, "Tonight I'm the designated decoy."