You’re all missing the point.
This was a job-related mental illness. He was a COOK, you remember? Day-in, day-out, year-in, year out, putting things in the oven - what did you expect?
He should be now collecting disability or workers comp or something, and the government should pay to re-train him to go into another field.
Pot =100% safe, no side effects whatsoever. It’s impossible that the pot had anything to do with this. Well, the whiskey maybe. But NOT the pot.