I work at a place where you can do an activity but cannot be intoxicated in any way due to saftey concerns. What is the polite way to acknowledge this to a potential customer? "I have to let you know, I smell marijuana on you and due to this I cannot allow you to participate for safety concerns as well as this being a family friendly environment." The way to go about it always feels blunt and non-courteous. Suggestions on what to say?