Duels; modifying elements of certain offense; establishing certain guidelines for consent as affirmative defense. Effective date.

SB 1820 amends Oklahoma law to classify dueling with deadly weapons as a Class C1 felony punishable by imprisonment. It also creates a new defense for assault charges (under Sections 644/647 of Title 21) where a defendant claims the victim consented to non-serious conduct that posed a recognized risk in the victim's occupation, medical treatment, or scientific research. This defense does not apply if the conduct was related to gang membership. The bill becomes effective November 1, 2026, and defines "serious bodily injury" as harm creating a substantial risk of death or permanent disfigurement.