The primary difference between public and private security are the roles of the policing
personnel. For public security the purpose is to protect the public, be it property, people, or crimes against property or people. Private security personnel's role is slightly different in that they protect the organization or property rights where assigned. These are primarily privately owned by the property or individual and may differ from public policy and procedure Craighead, 2003. Factors affecting the Growth of Private SecurityThe factors and level of training for security personnel has evolved significantly from those basically walking the perimeter and reporting disturbances. Today private property requires protection in many industries such as banking, medical, chemical, technological, manufacturing, even retailers and small businesses need security protection. The required security today includes…… Even perimeter security is in question. The GAO surmised that perimeter security at airports may be insufficient to provide effective security. The TSA has begun efforts to evaluate
the effectiveness of security related technologies. These include items such as biometric identification systems, but the TSA still has failed to develop a plan that will guide airports when technology enhancements are developed. The TSA has pursued the procurement of checkpoint technologies in order to address critical existing vulnerabilities, yet the GAO noted that these technologies are not being deployed on a wide scale basis Berrick 2008.