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.