Or. Admin. R. 230-140-0400 – Allowance of Mixed Martial Arts to be held in a fenced area or in a ring with five ropes.

(1) All mixed martial arts events held in the State of Oregon must be conducted in accordance with ORS Chapter 463 and the applicable rules set forth in OAR chapter 230.
(2) The provisions of this section do not apply to events held on land controlled by an Oregon Indian Tribe unless governed by an intergovernmental agreement between the Oregon State Athletic Commission and an Oregon Indian Tribe.
(3) Mixed maratial arts events may be held in a fenced area or ring with five ropes as specified in OAR 230-070-0000 and OAR 230-070-0025.

ORS 463.113

ORS 463.025, ORS 463.035 & ORS 463.500