The punishment for not taking the drug is that they don't let you take the drug?

Yep. because if you're not taking it, obviously you must be selling it.

And it gets more stupid because you know the test is coming, its not like its a surprise test. So for people who are coordinatedly selling it, they can easily defeat the system by saving like a weeks worth and then take it every day the week before the test. The test can't detect beyond 1 week for any of the top 3 ADHD controlled substances.