This research paper focuses on the topic of police officers, who usually assume four major roles in the following areas: law enforcement, order maintenance, provision of miscellaneous services, and convenience norm enforcement. They are expected to fulfill their various roles and duties. In every community, individuals and community groups have expectations on police officers. These expectations are various between different set of roles of police officers: prescribed, preferred, and enacted. The statistics concerning domestic violence is an indication of the severity of this problem. In the United States and around the world, the number of domestic violence cases, wherein most of the victims are women, is increasing today. The role of police officers in domestic violence has been under changes the same way that domestic violence cases were handled over the centuries. Interestingly, the society initially did not perceive domestic violence as criminal behavior. In fact, the criminal justice agencies concurred that “a man is free to do what he wishes in the privacy of his home.” Police officers also perceived domestic violence as something between a nuisance and a dangerous situation that must be avoided. The researcher then concluds that police officers may take the role of a counselor, lawyer, and even advisor. This is not as easy as it looks, as sometimes conflict of roles arises. In particular, the San Diego case, discussed in the paper show the important roles of police officers in combating domestic violence crimes.