Jackie Chan had no control of this movie (at least the American version). The director somehow thought that Jackie would come across better to audiences as a Dirty Harry cop! Didn't he realize that Chan is popular because of his stunts and kung-fu action? Apparently not, because in an interview years later, the director said he didn't regret his decision and kept claiming that Americans wouldn't accept Chan's Asian style.
Back in Hong Kong, Chan re-shot the movie extensively, adding car chases and kung fu action. He also edited out a lot of the American director's idiotic stuff. That version is supposed to be quite good. This American version? It's AWFUL! You'd never guess what Chan is capable of by just watching this movie. The action scenes here are *dull*. Yes, *dull*.
By the way, Chan next did POLICE STORY, as a "take that!" to that American director (James Glickenhaus, who hasn't done much lately. Hmm...wonder why....). See that movie instead of this!