Code of Silence is a 1985 cult action film directed by Andrew Davis and starring Chuck Norris.
It was typical for the genre and the star but filmed on location in Chicago with a few sub-plots. It featured Norris as Sgt. Eddie Cusack, a streetwise plainclothes officer who takes down a crime czar / drug lord responsible for officers being wounded in a botched drug raid. In the film's climax Norris teams with a more than menacing crime-fighting robot named "Prowler".
"Code of Silence" is a slang term for a police officer's cover for one another in circumstances where an officer makes a mistake or is corrupt. This plays a subplot whereby a rookie officer in the station covers up for an aging, alcoholic officer who accidentally shoots a teenage boy then covers up the murder by planting a gun on the victim.
Norris's character is the only one to speak out publicly against the corrupt officer and is temporarily ostracized by most of the other officers in his unit, until they learn the truth...