One night, a police officer was staking out a particularly rowdy bar for possible violations of the riving-under-the-influence laws.©OFFICEJOKES.NET

At closing time, he saw a fellow stumble out of the bar, trip on the curb, and try his keys on five different cars before he found his. Then, sat in the front seat fumbling around with his keys for several minutes. Everyone left the bar and drove off. Finally, he started his engine and began to pull away.©OFFICEJOKES.NET

The police officer was waiting for him. He stopped the driver, read him his rights and administered the Breathalyzer test. 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."