Former child actor Dustin Diamond is revealing some dark secrets about the popular teen sitcom "Saved By The Bell." Diamond, who played "Screech" on the show, is releasing a tell-all book titled "Behind The Bell," and the new issue of "Us Weekly" has a sneak peek. While "Saved By The Bell" and its cast was known for its squeaky-clean image, Diamond says drug use and sex ran rampant on the set. The 32-year-old says marijuana was popular among the cast members, stating that he could, quote, "smell a certain 'smoke,' wafting from the crack" underneath his castmates' dressing rooms.To read more about Dustin Diamond's "Behind The Bell," pick up the new issue of "Us Weekly," on newsstands now.