Defense Investigator, Gang and Prison Expert

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Years Experience


Happy Customers



Our Story

Trinity Private Investigations, Inc. is a full service agency offering confidential investigative service to individuals, businesses, and law firms throughout the San Diego area.

Trinity Private Investigations, Inc. is owned and operated by Dennis M. Bammann who is personally involved in all cases. Dennis became a licensed private investigator after serving honorably in the U.S. Marine Corps and retiring from the California Department of Corrections. As a Correctional Peace Officer, Dennis was a member of the Investigative Services Unit, where he conducted extensive internal criminal investigations. His knowledge, experience, and expertise prompted him to become a licensed P.I., where he offers a wide variety of services to the public.

Dennis is a member of the California Association of Licensed Investigators (CALI), Professional Investigators of California Association (PICA), National Association of Licensed Investigators (NALI), and the National Association of Investigative Specialists (NAIS). Dennis has been a guest speaker at many colleges, including UCSD,USD, Southwestern College, and other forums, where he lectured about gangs and criminal activity. He also attended the 2007 Capital Defense Seminar.

Trinity Private Investigations, Inc. is committed to giving you the best service possible. We maintain the highest standards for efficiency, reliability, and timeliness using the most innovative and current investigative resources. We provide our clients with comprehensive investigative results in a highly professional and discreet manner.


We Only Work With The Best & Most Qualified


California Association of Licensed Ivestigators


Professional Investigators of California Association


National Association of Legal Investigators


Association National Association of Investigation Specialist


California Criminal Defense


Defense Investigators Association


The PI Group