Watch Under Oath for Free: How to Stream the Movie Online at 123Movies. . Two honest cops decide to cross the line for a one time score. But a simple plan to shake up an illegal arms dealer goes bad, resulting in his death. When their victim turns out to be an undercover FBI agent, a bad situation only turns worse. In a bizarre twist of fate, they are assigned to solve the murder. Now they must uncover and destroy the very evidence that could put them behind bars for life.