"Stop and frisk" refers to a police officer briefly stopping a suspect to garner information, as well as pat down the suspect for weapons or dangerous materials, according to Cornell University Law School. The police officer must have reasonable suspicions that the person is involved in a crime.
As part of the Fourth Amendment in the U.S. Constitution, police officers have the right for stop and frisk. However, in some areas, like New York City, the practice has elevated to a point where many believe that it is unconstitutional, according to the New York Civil Liberties Union (NYCLU). The NYCLU reports that the New York Police Department has been accused of requesting illegal stops by people and profiling potential suspects by race rather than their actions.