Located in Los Angeles, California, Tristar Investigation is a full service detective agency with a 28-year history of producing positive results for our clients. In addition to serving California, we offer services nationwide, and worldwide, through our affiliates and professional associations. See the bottom of this page for a list of Southern California cities we serve. For three decades Tristar Investigation founder Bruce Robertson has been featured as an investigation expert on broadcast television, cable news, radio, newspapers and magazines such as The New York Times, CNN, The History Channel, MSNBC, Fox News, Los Angeles Times and a many more. Plus, their team of private investigators has in-depth knowledge or background in law enforcement. Tristar Investigation is a member of the National Council of Investigation and Security Services, the California Association of Licensed Investigators, and the National Association of Legal Investigators.