One night a police officer was staking out a particularly rowdy bar for possible violations of the drinking-under-the-influence laws. At closing time, he saw a fellow stumble out of the bar, trip on the curb and try his keys into five different cars before his own. Then he sat in the front seat of his car fumbling around with his keys for several minutes.
As this was happening, everyone else had left the bar. The police officer was just sitting and waiting for him. The officer was so excited to be stopping this drunk! He stopped the driver and read him his rights and administered the breathalyzer test. The results showed a reading of 0.00. The puzzled officer demanded to know how that could be. He even offered medical assistance if he was ill.
The driver just smiled at him and said that all was fine. It's just that officer I must confess I was just the designated decoy for the evening!!!