Occupations in the field of security break down into four primary categories. Each of these disciplines have a specific area of expertise and tactical application. Some applications overlap, but as a general rule, they are best used in coordination with one another. Overt control of disruptive individuals or groups is their strong suit and often their mere presence is sufficient to keep things orderly. Security guards will run from very well trained to minimum wage with little or no training whatsoever.
Police generally have a duty to act once a law is broken.
The Private Investigator may or may not be a former police officer. In either case, the professional is a person with a talent for finding information. Their expertise is often invaluable in gaining information on an individual or group that poses a threat to an event, VIP or individual. This person may or may not be a former police, secret service or military. The EP agent is trained and skilled in the areas of threat assessment, planning, observation, safe movement, detection, and evacuation.