For me, a slightly better than average Martin Lawrence action comedy isn’t cause for celebration, just an occasion for yawning a little less strenuouslybut fans who think he’s the cat’s pajamas may be dancing in the streets. This time he’s playing a jewel thief who impersonates a cop in order to recover a diamond he once hid in the police station’s ventilation system. This occasions lots of gags about the innocence and gullibility of copsnot to mention the usual valorizing of guns and vigilante justice and tedious action sequences to begin and end the picture. Les Mayfield directs, while the script, predictably, is by several hands; with Luke Wilson, Peter Greene, and Dave Chappelle. (JR)