one good cop be the story of a new york narcotic agent ( michael keaton ) who take revenge on the city most powerful drug dealer after his partner of eight year ( anthony lapaglia ) be shoot and kill by some goon who be high on the dealer supply . unforunately and what may have be a remotely engage idea turn out to be one hell of a boring cop drama . on the one hand and you have this story of a ballsy cop who be willing to single handedly take on this dangerous drug dealer and his top level goon . but this plot and which offer incentive for some intense action sequence or at least thriller appeal and be muddle by the other part of the plot which try to compete for equal and if not more attention . that be and the when the agent partner be kill and he and his wife ( rene russo ) suddenly find themselves to be the foster parent of that guy three little girl . so and we have the family bond sentimental moment and which tend to drag much long than they should and and really get in the way of anything in the major story ( the revenge on the drug dealer ) get accomplish . it take about fifty minute for the movie to even get remotely interesting and a they finally show you be the heck this dumb story be go and why the hell you should even watch it . viewer start the movie at this point and would not have miss much . prior to that and there nothing in the movie to really command your attention . you would think once a powerful drug dealer felt even the least bit threaten by one narcotic agent work alone ( he do not even seem to be a cop with heavy connection and influence ) and then he would immediately send out his goon after this guy and family . that would have make an intense story and but no . we have to sit through fifty minute of one couple try to bond with three little girl . who care .