Police officers have significant discretion in making decisions like arrests, traffic stops, and use of force. This chapter discusses police discretion and efforts to control it. It defines discretion as actions based on an officer's judgment. Discretion is involved in critical decisions and street-level officers act as policymakers through their decisions. Written policies, administrative rulemaking, and oversight aim to structure discretion to prevent abuse and promote consistent, fair policing, though complete control of discretion is impossible.