When organisations and individuals work together for the same purpose and upholds the same responsibilities, the system formed is known as a crime prevention system.
One cannot deny the contribution and effectiveness of police but public perceptions view and claim that police make only minimal contributions to crime prevention in the context of far more powerful social institutions, like the family and labour markets. The fact appears to lie in between. This is to admit that police prevents crime by focusing on its prioritised objectives, tasks, places, times and people but this is also a fact that putting police where serious crime is concentrated, at the times it is most likely to occur. (Farrington et al, 2002, p. 295) Therefore police force is only a small part of CJS and not the only one to contribute towards an error free society.
Violent crime includes robbery, homicide, serial violent crime, assault, and rape. It is named violent as it is conducted by the use of arms, weapons and force. Some of them have profit as a motive while others involve revenge or fulfilment of a psychological drive. Another commonality to violent crimes is that they include various events and have the potential to leave physical evidence. (Peterson, 1994, p. 89) However the leftovers of physical evidence is not necessary.
Violent crimes may result in lengthy investigations if the assailant is unknown. The investigative process includes gathering, evaluating, and analysing data and arriving at additional leads or hypothetical conclusions regarding the assailant. Evidentiary documents beyond the crime scene may also be gathered to provide background information on the victim or the alleged perpetrator. These, when analysed, can provide insights into the persons involved in the crime which may speed the investigative process.
Violent crime investigation is often the responsibility of the major crimes section of a police or prosecutor's office. Investigators or detectives from municipal to federal agencies may be involved in the investigation of violent crime. Violent crime is not limited to be prosecuted at the municipal or county level because of the factors that it upholds can cause the case to be assigned to a multi-jurisdictional task force. Among them is the location of the crime, the potential of the crime to be part of a series of similar crimes committed by the same perpetrators, or the crime's connection to offences prosecutable in a different jurisdiction or at a different level of government.
Detectives or investigators assigned to violent crime units respond to specific reports of crime which are generated by the victim or witnesses and may be lodged through a patrol officer who has gathered data from the scene of the crime or has made the location of the crime secure while awaiting the arrival of investigators and physical evidence technicians.
Evidence and statements of victims during crime spot are the two predominant sources of leads in violent crime investigation which help solve the case. Reviewing data from the incident and comparing it to similar incidents are analytical functions.