But we can't tell who it is!

Someone at dancing yesterday had recently had their hair colored or permed or otherwise chemically modified, and left a trail of unpleasant chemicals throughout the room. I stayed for an hour because I had agreed to teach a few dances, but then left. Everyone knew why I was leaving. The leadership group had agreed to speak to people when this happened, but the most assertive person was away.

Because they can't tell who it is, they don't do anything at all. I have a couple of guesses, but I stayed away from my suspects rather than cozying up to see who it was.

Obviously someone violated our fragrance-free policy, whether through not paying enough attention or figuring they could get away with it. Which they did.

Any suggestions about how to handle this, for me and/or for the rest of the leadership group who are supposedly enforcing our fragrance-free policy? I find I don't have the energy for big dramatic announcements, or even to deal with the "Oh no it's not me!" denial.