I worked at a job that "Randomly" drug tested 2 employees from each shift every quarter. There were 2 shifts, 100 employees each.
I got tested 5 quarters in row. They knew I was an occasional smoker of left handed cigarettes but I passed every drug test and they hated me for it. What they hated me for even more was the fact that I showed up on time every day, did my job w/o any complaints from quality control and kept my mouth shut. Kinda odd huh...
(The management and HR dept were a bunch of extreme liberals at this place, and I was a vocal Bush supporter.)
I would even sometimes wear a shirt that said. "*** Kickin' Homegrown!."
With a picture of a rebel flag and a pot leaf. They HATED that. Would drug test me within a week, I'd pass and they would be tied in knots of frustration.
Anyway the odds of my employee number actually coming up every time was like winning the lottery.
Ski, if you got 11 of them dropped on you in a year I would say:
1.- somebody above you has it out for you
2.- the government has way too much time and money on its hands
3.- both