MO SB199

Creates Section 537.570 establishing civil liability for any person acting under color of state law who deprives others of rights secured by the Missouri Constitution, allowing injured parties to bring private civil actions and authorizing the Attorney General to sue on their behalf

Adds an "objective reasonableness" standard for police use of force, requiring that physical force used in arrests be objectively reasonable based on the totality of circumstances confronting the officer, regardless of the officer's intent or motivation

Restricts law enforcement use of deadly force to situations where the person has committed or attempted a felony involving infliction or threatened infliction of serious physical injury, is escaping with a deadly weapon, or may endanger life or cause serious injury if not arrested immediately

Includes an emergency clause for immediate implementation of the deadly force provisions to align Missouri law with U.S. Supreme Court precedent

Sets January 1, 2017 as the effective date for certain provisions of Section 563.046