Research Summary: This research uses data from the National Crime Victimization Survey to test whether legislation affects domestic violence, police involvement, and arrest. Findings suggest that most laws do reduce the chances of family or intimate violence. Fewer appear to influence police involvement, and none relate to more arrest. This suggests that laws may deter would‐be offenders from harming family and partners.Policy Implications: The findings suggest that states should continue to aggressively pursue domestic violence offenders. However, local officials should recognize that mandatory arrest laws could reduce the number of cases that enter the system. Further, more protection should go toward victims when the state awards them custody of the children.