The police doesn't have much of discretion on the subject according to common training material. Consider the following points selected from Stop Violence Again

The police doesn't have much of discretion on the subject according to common training material. Consider the following points selected from Stop Violence Against Women website[1]: To determine the predominant aggressor, police must consider: The seriousness of injuries received by each party The height and weight of the parties Which party has the potential to seriously injure the other party Orders for protection that have been filed by a party Whether a party has a fearful demeanor Whether a party has a controlling demeanor -- [1] http://www.stopvaw.org/determining_the_predominant_aggressor http://www.stopvaw.org/determining_the_predominant_aggressor