In“Impulse”a female undercover cop（Russell）stings johns，gets involved with a drug bust，and……yada yada yada. A typical and ordinary Hollywood crime genre product with Russell and Fahey sharing the spotlight，“Impulse”is a par flick，shot entirely IN and around L.A.，with the usual ugly bad guys，macho cops，chases，shootouts，etc. with theemphasis on drama over action. Nothing new here. Best enjoyed with your favorite beverage and munchies.