Mr. Crystal, by all accounts a superb detective, reported the beating by officers of a handcuffed suspect in 2011. According to Mr. Crystal, the sergeant to whom he initially reported the assault told him not to "snitch." Mr. Crystal then reported the matter to an assistant state's attorney and testified against the officers despite, he said, being threatened with perjury charges by a lieutenant. Although the officers were convicted for their roles in the assault, Mr. Crystal says he was harassed and run out of the department for being a "rat."