Owen Gleiberman Chief Film CriticIn one of the more effective scenes in “Copshop,” a hitman, played with psychotic geek gusto by Toby Huss (rocking a Ben Davidson mustache), strolls into a desert police station in Nevada carrying a bouquet of birthday balloons. He kills several cops, and he ends up walking down a hall blasting away — with a snub-barreled submachine gun that spits out bullets with raw fire — at a door made of bullet-proof glass.