Stakeout

[Zx12Piglet]

a cop is staking out the Killarnet Hotel for bikers riding drunk. at closing time, he sees a biker stumble out of the bar, trip the curb, and fumble for his keys for 5 mins.
when he finally gets on the bike, it took him another 5 mins to get the key in the ignition. meanwhile, everybody else leaves the bar and rides off. when he finally pulls away, the cop is waiting for him, pulls him over, and gives him a breathalyzer test.
the test shows he has a blood alcohol level of 0.0. the cop says, "how is this possible?" the guy laughs and says, "tonight I'm the designated decoy!"