Director Joe Carnahan’s latest high-energy actioner easily fulfills the genre’s requirements of blood, guts, bullets and octane, to reference the title of the director’s first film. Copshop delivers an ultraviolent game of cat-and-mouse between a ruthless hired killer and his would-be target, with a determined rookie cop caught in the middle. The ’70s-style synth-heavy musical score, of which Lalo Schifrin would be proud, adds to the enjoyable grindhouse aesthetic.
That the cat-and-mouse game occurs largely in an expansive Nevada police station is one of the cleverly amusing conceits of the screenplay by Carnahan and Kurt McLeod. Featuring the most violent mayhem in such a setting since Assault on Precinct 13 and The Terminator, the film takes place in the Gun Creek Police Department. There, quick-thinking con artist Teddy Murretto (Frank Grillo, apparently competing with Eric Roberts for the record for most onscreen appearances in a single year) has managed to get himself arrested by sucker-punching a female cop, Valerie (Alexis Louder). Teddy was hoping to avoid the clutches of veteran hitman Bob Viddick (Gerard Butler), but his plan is foiled when the equally clever killer gets himself hauled in on a drunk driving charge and is placed in a cell next to his quarry.
Source : https://www.hollywoodreporter.com/movies/movie-reviews/gerard-butler-in-copshop-1235009987/238