he's not operating any heavy machinery, and I don't think weed gives an unfair advantage like roids. I could see him getting axed if he can't follow the playbook or shows up late, and doesn't give the effort, or produce. so I guess I would not test for weed. just harder stuff like herion, coke, oxycotton, etc.
this new testing stuff can get carried away. where was it with johney rodgers or mercury morris, who were on much harder stuff?
but, I don't think he should be high on the job. and the problem is they don't have testing specific enough to determine, if he's high while on the job or on his own time.
there's a big difference to me if he's high while playing or practicing, compared to if he's out fishing or watching a movie at home.