That’s the issue being discussed here. The tests will also show up if you smoked the week before on your day off. They don’t determine whether you were high on the clock or high on the weekends only. It penalizes people who smoke weed in their free time, as opposed to people who are actively causing a problem. Additionally, booze, meth, and heroin for example, are all out of your system much faster, so it doesn’t really do a good job of determining whether or not they’ll be blitzed on the job either, which is what the comment you replied to said. The point being made is that the drug test isn’t actually going to prevent anyone from being drunk on the job, but it will prevent you from hiring the guy who tried weed once in his free time.

I have Generalized anxiety disorder, It’s chronic and therapy doesn’t “cure” it. I will most likely struggle with it for the rest of my life. While this may be an anecdotal example I’m not aware of anything that “cures” anxiety disorders, therapy is mostly there to manage the symptoms effectively. Therapy helped me understand and somewhat mitigate the problem, but it’s not something I can ever be rid of, and that’s how it is for a lot of people who have an anxiety disorder.