Nongovernmental police or security force

Identify and discuss at least 3 different types of nongovernmental police or security forces. You may also choose to profile 3 real-life private detectives or bounty hunters by presenting a biography and history on them and their exploits.
You may combine the above two tasks as long as you explore at least 3 forces or detectives in your combination.
Research and discuss at least 1 example of criminal wrongdoing by a private police or security force or personnel. This example does not have to be about one that was already covered, and it does not have to be from within the United States. Where possible, your discussion of the research should include statistical data about the different types of nongovernmental police or security forces.
Express your thoughts and feelings about the use of nongovernmental police and security forces. Do you have any policy recommendations for or against them?