 Early drafts for the Harlan Ellison (qv) episode "City on the Edge  of Forever" included a guest character, Beckwith, an Enterprise crew  member who dealt in addictive "Jewels of Sound; it was Beckwith who  escaped into the past, via the Guardian of Forever.  Gene Roddenberry (qv) asked him to change this element, on the  grounds that no member of *his* crew would ever use or deal in  illegal drugs. According to Ellisons account in the book "Harlan  Ellisons the City on the Edge of Forever: The Original Teleplay  That Became the Classic Star Trek Episode", for years after the  series was cancelled, Roddenberry said that Ellisons original draft  had been unusable because "he had Scotty dealing in interplanetary  drugs" 