Got done myself for drink driving a few years ago, had a bit of a drink problem at the time,bit of a drinking culture at work too,used to finish work,straight down the pub, have an absolute skinfull, then drive home.
Did it for years, and got away with it for years too, just lucky that never hurt or killed anybody.
Pulled over 5 minutes from home one Friday night, because had turned an extra notch on my lights and had my fog lights on, as soon as the blue lights came on behind me, knew I was a gonner.
18 month ban, and £600 quid fine, had 68, just under twice over the limit, which was a surprise as must have had 7 or 8 pints of 1664 that night.
Did a Drink Driving Awareness Course, to knock 3 months off my ban, and that was an eye-opener!
The limit is 5 units at the moment, a pemium lager(Stella, 1664, Peroni etc, 5%) is 3 units.
You lose one unit per hour, so you don't need many to be over.
Apparently metabolism, build, etc, dosn't make a difference to the reading, just maybe the ability to "handle" the alcohol, I used to be able to drink a lot without noticeably feeling any effects, but don't let being "able to handle your beer", fool you into thinking you're okay, because you're not.
Had to list how much we would drink in an average week, and scarily i was doing 240 units a week, and barely drank at weekends, ended up in intensive care for a week in Majorca with acute pancreatitis due to it, about an hour away from dying apprently, had the same symptoms as a heart attack.
Luckily a good doctor treated the correct symptoms, and i survived to annoy people on CCFC websites.
With people like McCormick, feel "There but for the Grace of God", feel terribly for the victims family, and don't really know what I would have done if It had been me in the same situation.