Must I work as executive protection specialist / bodyguard through a Private Investigative Agency?
In most states, no. Commonly, an individual may be an executive protection specialist/bodyguard if he or she is employed directly by the principal as his W-2 employee, and must still be state licensed accordingly. You cannot 1099 sub-contract. However, if there is no agency involved, the liability is directly on the client and his personal liability insurance.