Police corruption is the abuse of police authority for personal gain. Corruption may involve profit or another type of material benefit gained illegally as a consequence of the officer's authority. Typical forms of corruption include Bribery, Extortion, receiving or fencing stolen goods, and selling drugs. The term also refers to patterns of misconduct within a given police department or special unit, particularly where offenses are repeated with the acquiescence of superiors or through other ongoing failure to correct them.