I agree. An off-duty cop is just off the clock. By the way the news reads there really is no such thing as an off-duty cop. A cop is always on the job. Describing a cop as off-duty suggests that he suddenly becomes a normal citizen like everyone else once the clock is punched at the end of the shift. But I'm willing to bet an off-duty cop has no issues with using police powers, if necessary, while off the clock.