Situation:
Community theatre, cast drawn from the borderline professionals in the area for a fairly risqué production (a lot of simulated drug use on stage).
Rumor (and only rumor) is that members of the cast have, in the past, used and/or sold drugs during productions, in the theater. I may be coming into this as the production SM, somewhere around 3 weeks prior to opening for a 6 week run. All the actors do sign a contract stating a fairly standard no illicit substances, which has been inconsistently enforced at this venue in the past.
My inclination is (coming in part way through the process) - talking to the director so he is clear the policy is not at the theatre, and sober when they get there. Trying to find a way to give the same to the cast without being too obvious. Giving it in the pre-tech speech (which I always do so everyone knows what the plan is) makes some sense, but is that too late (I will have been there for at least a week by that point).
Given it is community theater, and there are no understudies, and this may be a thing that has happened and been acceptable in the past, any suggestions if the director/producers seem unwilling to enforce (to include dismissing actors?). Walking away is an option, but not the most constructive one.
Edit added label to subject line-Rebbe