The script was originally offered to Clint Eastwood as the fourth Dirty Harry film with a working title of "Dirty Harry IV: Code of Silence". but Eastwood turned it down. In 1979, the screenplay had been written and offered to Warner Bros., the studio that made the "Dirty Harry" movies. The fourth installment in that film franchise ended up being another movie instead which was Sudden Impact (1983). Eastwood already was working on Pale Rider (1985) the same year with the same screen writers of this film.
The scene where the two hoods walk into the tavern to rob it, only to find that it's full of cops is based on an actual event that took place in an infamous after-hours bar on Chicago's near North Side where policemen gathered after their shifts. Among the cast are several veterans of the Chicago Police force including Dennis Farina.
Considered as something of a comeback-vehicle for Kris Kristofferson after the disaster of Michael Cimino's Heaven's Gate (1980). Kristofferson found it way too violent and did Flashpoint (1984) instead. That movie was made a year before this picture and was written by the same two screenwriter who wrote this film.
The script was written for both Clint Eastwood and Kris Kristofferson but they both turned it down. Ironically, the screenwriters who wrote the story for this film also wrote Pale Rider (1985) and Flashpoint (1984) in which Eastwood and Kristofferson each starred in respectively.
After the film in development was passed over by Clint Eastwood and the Warner Bros. studio, an 18th June 1980 article in show-business trade paper 'Variety' reported "Slott has "Code Of Silence," a $7,000,000 thriller about a cop". The Wikipedia website states that this story reported "the script was briefly in the possession of Canadian producer Gene Slott, who was looking to make it in 1980."
One of two cinema movies that action star Chuck Norris starred in that were first released in theaters in the year of 1985. The two theatrical feature films are Code of Silence (1985) and Invasion U.S.A. (1985).
The production "bought the script for a whopping [US] $800,000" according to Ron Base in a 11th February 1986 article published in the 'Toronto Star' newspaper. This was, according to the piece, "more than the total cost of a lot of Chuck Norris movies".
This Dirty Harry (1971) style movie, based on a script originally intended to be that franchise's third sequel, referencing both that picture and the name of Code of Silence (1985)'s star Chuck Norris, this flick was jokingly nick-named "Dirty Chuckie" by film critic Leonard Maltin.
The meaning of the movie's "Code of Silence" title, according to a definition at the Wikipedia website, "is a condition in effect when a person opts to withhold what is believed to be vital or important information voluntarily or involuntarily." In the picture, it is also referred to as "nobody talks" and "Omertà", with the same web source defining the latter as a Mafia term, "a code of silence about criminal activity and a refusal to give evidence to the police."
Technical specifications, armory, and gadgets that featured on the Prowler police tactical assistance robot included a Doppler radar, one M-40 recoil-less rifle, infra-red heat sensors, two Mark 19 grenade launchers, and twin HB .50 caliber 50mm machine-guns. The robot featured a simplified Mark 2 hand-held control system which utilized a remote control hand-controller. "The Prowler" also featured both a target acquisition system and a laser range & guidance system.