Full Eclipse

Full Eclipse is a 1993 science fiction crime film directed by Anthony Hickox. Starring Mario Van Peebles and Bruce Payne, the story is set in Los Angeles where the police department has assembled a unique squad of officers who possess the ability to turn into werewolves. The tagline of the film was Theres a new police force on the streets... and they only come out at night.

Although Max is skeptical as to whether he will derive any benefit from the meeting, as he and his wife had already attended counselling sessions without success, he reluctantly attends the meeting at Garous apartment where he meets other police officers who have experienced problems such as Casey Spencer and Ramon Perez. Everyone who Max meets at the meeting praises the impact that Garous influence has had on their fortunes. Max soon realizes that the activities of the group consist not merely of talking but also entail embarking on vigilante missions to clean the streets of criminals.Max advises Garou that he is not interested in joining the group, but he immediately forgets this and agrees to accompany them to a party where criminals are exchanging weapons. Before gatecrashing the party, Max, being a veteran detective, notices that each of the group members injects themselves with a strange chemical, which he learns has been produced by Garou. After they have injected this chemical, Max notes, thanks to his finely honed powers of observation, that Garou and his group are transformed becoming more powerful and seemingly impervious to injury. The next day Max attempts to advise his incredulous boss of the strange goings on, but to no avail. ........

Source: Wikipedia