Doesn’t help if you are a VA or Federal employee: Please note! I was a VA employee many decades ago. Now I’m retired so I answer to nobody. I’ve got my state approved letter from a doctor, seal and all. But you know what I would do if I needed VA health care? I would not tell them, ever. Would not want it on my records. The same as I don’t apply for the official state card. I don’t need to and Sessions could ask the states for their user lists to decide who to round up for the concentration camps.
What I would do is take their piss test if they required it after abstaining for a few days. If they confronted me about THC metabolites I would tell them I don’t smoke but some of my friends or relatives do (legally as MMJ patients), and I have been present recently when they were smoking. After a few days, they can’t really tell if you were smoking or just in a smokey room. They certainly can’t tell you who you should or should not hang out with!
They might not even bother confronting you: I think they are mainly looking for opioids they did not proscribe for you, so they can prevent addiction. It’s the vicodan, oxy, heroin thing.