Oregon Predominant/Dominant Aggressor Law

(c) When a peace officer makes an arrest under paragraph (a) of this subsection, the peace officer shall make every effort to determine who is the assailant or potential assailant by considering, among other factors:

(A) The comparative extent of the injuries inflicted or the seriousness of threats creating a fear of physical injury;

(B) If reasonably ascertainable, the history of domestic violence between the persons involved;

(C) Whether any alleged crime was committed in self-defense; and

(D) The potential for future assaults