Our goal is to provide accurate and timely information in a cost -effective manner that supports our clients in making decisions vital to their professional success.
Castle Security Group is a Maryland Private Investigative Company. Our private investigators are licensed in Maryland, as well as additional states. Many of our private investigators are former police officers, police detectives, or have military experience.
Castle Security Group was established in 1981 by Frank Napfel. CSG has served some of the largest corporations, law firms, and insurance companies in the country. We have taken a leading position in the movement to professionalize the investigative industry. We enjoy high standards and active memberships in the American Society for Industrial Security, World Association of Detectives, Maryland Investigators and Security Association (MISA), and Professional Investigators Alliance of Maryland.