Actually had a problem about three years ago at the club with a couple of "pill poppers". They were afternoon flyers so it went on for quite awhile before the officers found out. They were kicked out and of course threatened to sue. We just refunded there dues and it went away. Also had to ground for a few months one of the "senior" pilots after he changed his heart medication. In that case he had the right attitude as he knew that he was unsafe. But he did leave the club the next year and took up flying "ultralights", untill his wife and grown up son grounded him. .