Predominant/Dominant Aggressor Law

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… Notwithstanding the foregoing, when an officer has reasonable cause to believe that more than one family or household member has committed such a misdemeanor, the officer is not required to arrest each such person. In such circumstances, the officer shall attempt to identify and arrest the primary physical aggressor after considering: (i) the comparative extent of any injuries inflicted by and between the parties; (ii) whether any such person is threatening or has threatened future harm against another party or another family or household member; (iii) whether any such person has a prior history of domestic violence that the officer can reasonably ascertain; and (iv) whether any such person acted defensively to protect himself or herself from injury. The officer shall evaluate each complaint separately to determine who is the primary physical aggressor and shall not base the decision to arrest or not to arrest on the willingness of a person to testify or otherwise participate in a judicial proceeding.