That was the only story I found, although I didn't see the reference to the age of the audience members. One of the purported acts was Morrison on his knees in front of the guitar player pretending to, uh, you-know-what. There was an inference that the only "witnesses" were Miami LEO who didn't like long-haired hippy boys. Morrison was posthumously pardoned. I'm not sure where the truth lies with that. The author may have been a sympathetic fan. I guess the message there is Don't Do Drugs.