Ohio Predominant/Dominant Aggressor Law

2935.032

(ii) If the officer has reasonable cause to believe that, during the incident, the offender who committed the felonious assault and one or more other persons committed offenses against each other, the officer shall determine in accordance with division (B)(3)(d) of section 2935.03 of the Revised Code which of those persons is the primary physical aggressor. If the offender who committed the felonious assault is the primary physical aggressor, the officer shall arrest that offender for felonious assault pursuant to section 2935.03 of the Revised Code and shall detain that offender pursuant to that section until a warrant can be obtained, and the officer is not required to arrest but may arrest pursuant to section 2935.03 of the Revised Code any other person who committed an offense but who is not the primary physical aggressor. If the offender who committed the felonious assault is not the primary physical aggressor, the officer is not required to arrest that offender or any other person who committed an offense during the incident but may arrest any of them pursuant to section 2935.03 of the Revised Code and detain them pursuant to that section until a warrant can be obtained.