A former personal assistant to Sean “Diddy” Combs gave a glimpse into the hip-hop promoter’s world when he worked for him nearly two decades ago, testifying at the hip-hop promotor's sex trafficking trial about his former boss' use of guns, lie detector tests and drugs. David James' testimony came in the second week of a trial in Manhattan federal court that is scheduled to last up to two months. James was one of several former Combs employees expected to testify, as prosecutors try to prove that Combs for two decades used threats and violence to control employees and associates and commit crimes.