In cooperation to the mission of protecting safety of society, police officers actively take an action that is commonly called “stop and frisk”. This allows them to detain the suspicious drivers and pat them down to scrutinize whether they carry illegal contraband or drugs or weapons in their cars. The existence of racial profiling in police’s duty is accused as black drivers and hispanics drivers are more often to be pulled over than that for white drivers. Since blacks and hispanics have committed more crimes, it is reasonable that they become suspects in police’s perspective and comprise the majority of people who are stopped and frisked. In despite of racial controversy regarding “stop and frisk”, this strategy, in fact, brings more positive