well I don't think pot is a serious legal matter in Canada. I spent a week in Toronto a couple of years ago and I saw people smoking it several time out in plain veiw. Also, work place drug testing is against the labor laws in Canada. Unless it has been changed since I was there in 2003.
You could think of government workers like teenagers. You pay them an allowance, but do you get any work out them? They eat the food, put their feet on the furniture and complain loudly whenever they are unhappy.