2. A public safety nuisance exists when it is established by clear and convincing evidence that an owner, manager, employee, contemporaneous patron, or guest of an adult establishment commits any of the following acts either on the premises or in any parking lots or areas, including but not limited to public rights of way, adjacent to the 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 three or more dates within a twelve-month period to which the police respond and disperse a crowd. The participants need not be the same persons for each incident.