Irish Driver's Drinking

Late one Friday night, the Garda spotted Sean O'Connell driving very erratically through the streets of Dublin. They pulled him over and asked him if he had been drinking that evening. "Aye, so I have. 'Tis Friday, you know, so me and the lads stopped by the pub where I had six or seven pints. And then there was something called "Happy Hour," and they served these mar-gar-itos, which are quite good. I had four or five of those. Then I had to drive me friend Seamus home, and, of course, I had to go in for a Guinness or two - couldn't be rude, d'ye know. Then I stopped on the way home to get another bottle for later..." And he fumbled around in his coat until he located his bottle of Jamieson's, which he held up for inspection. The Garda sighed, and said, "Sir, I'm afraid I'll need you to step out of the car and take a breathalyzer test." Very indignantly, indeed, Sean said, "Why? Don't ye believe me then?!?"