If anyone thinks about trying something, setup a private meeting with them.
I've heard that quiet publication of the results of that meeting (whatever you choose to make those results) can be a great deterrent to others with similar ideas.
Actually, the Tuskegee Airmen story was taught in my US History class in high school - don't remember for sure if the Tulsa Massacre was, but I think it was too. It's been a handful of decades since then :-).
Needs to be taught more to everyone. - one Anglo-Saxon American (i.e. white)
I wonder if you could fit a curtain made of strips of hanging plastic/cloth over the door into it so that works as a containment barrier for the "perfumed air" until it gets picked up by the machine.
You don't tug on Superman's cape . . .