motion detector alarm
, icks, T. A. , Van Meter, C. W. 2000. Chapter 8: Crime and the threat environment. Principles of security and crime prevention, 4th ed. Cincinnati, OH: Anderson Publishing. Friedman. …… Private SecurityThe various factors that influence both the definition and the perception of private security are typically environmental but can be internal and external to the issue of security itself. In most developed nations, the state provides security forces that are paid for by tax payers local, municipal, state and federal police, and military forces; however, private security forces, typically operated by ex military officers who bring their training and experience
into the private sector to fill gaps in the market where demand
cannot be satisfied by state security apparatuses alone, do exist and do operate both in developed and developing nations.