1. A public safety nuisance exists at a licensed premises for purposes of this section when it is established by clear and convincing evidence that an owner, manager, employee, contemporaneous patron, or guest of the licensed premises commits any of the following acts on the licensed premises or in any parking lots or areas, including but not limited to public rights of way, adjacent to the licensed premises:
- a. Unlawfully discharges a firearm or uses an offensive weapon, as defined in section 724.1, regardless of whether it inflicts injury or death.
- b. Assaults another person with a dangerous weapon as defined in section 702.7 resulting in injury or death.
- c. Engages in a riot as defined in section 723.1 on at least three separate days within any twelve-month period in which a peace officer responded for purposes of dispersing the participants in the riot. A person who willingly joins in or remains a part of a riot need not be the same person for each riot incident.