M.A. Knott Investigations & Security Services, LLC is right here in Northern New Jersey M.A. Knott Investigations & Security Services ® P.O. Box 633, Ridgefield, NJ 07657 We are a licensed and bonded agency that specializes in nationwide comprehensive background investigations, locating missing persons, asset searches, and class room instruction on gang awareness Interested in learning more about our services Is our commitment to you