The purpose of The Law Officer’s Pocket Manual is to provide law enforcement personnel with basic operational knowledge of the impact of constitutional law on police practices. The Manual is not a guide to police technique. Officers should always defer to their departments’ operational manuals. The statements and rules in the Manual flow from the U.S. Supreme Court’s decisions through the Court’s 2020–2021 Term, which was completed in June 2021. The Court’s rulings dictate what the Constitution permits, requires, or forbids. They do not necessarily represent the only course of action permissible. Therefore, they may differ in detail from practices instituted by local law enforcement officials.