Zero tolerance is the rule. I know of cases where the (commercial fishing) vessel was seized just because an item of drug paraphernalia (short length of brass tubing found in engine room parts drawer that tested positive for hashish residue) was found on board. Serious stuff.As I remember it is zero tolerance and both commercial and recreational In navigable waters. I was a boarding officer in the 80’s and 90’s. Not sure if rules have changed.
I make all my guys drug test to even drive company vehicles. They are all commercial plated. Legally with commercial plates they can’t stop and get a six pack on the way home from work.
I do not allow recreational drugs on my boats. So far, no alcohol on even my pleasure boats, either, but I would likely relent and allow for moderate use by a guest or passenger (never a crew member or deck officer).
In many of the cases I have handled in Alaska and Washington involving injured commercial fishers, drugs were involved. Alcohol only rarely. (The alcohol-related cases seem to be more related to falls off the dock late at night or fights at a nearby bar after delivering the catch.)
A gillnetter I fished alongside at Bristol Bay had a captain who smoked pot every day if it was rough out, to stave off seasickness he said.Not sure whether that remedy gave him the courage on one particularly wild opening to strip buck naked, dive under his disabled boat with a knife in his teeth and cut someone else’s web out of his wheel. His boat was half full of fish and drifting over a shoal, occasionally hitting bottom in the troughs. The water there is the color and consistency of chocolate milk, and under 40 degrees at that time of year (late June). He was under water a full two minutes, then shot up out of the water and over his gunwale with a huge grin and seaweed in his shoulder-length hair. Success! Back underway immediately. Quite a sight from our boat, 50’ away. Nevertheless, I don’t recommend it.