With all of these different types of PIs, how do I ensure that my case is handled by the proper personnel?

If you are hiring a sole PI, it will require a little research on your part to ensure that the PI you are interested in hiring, is experienced enough to handle the many different avenues of an investigation. He or she will also need the experience and lack of ego to know when to bring in others who may know more about a topic than their own personal knowledge.

An easier and usually more reliable way to ensure you are getting the correct person for your case is to contact a medium-sized regional Investigative Agency that will often specialize in several different types of cases. Some of the larger agencies will handle almost all types including doing government contracting work and focus on these and corporate investigations. Typically, they will sub-contract out smaller and private cases to those regional and sole Private Investigative agencies.