John A. DeMarr PI – Investigation Services
The California Private Detective and California Private Investigations Firm
Since 1988, John A. Demarr, P.I., has been providing professional, licensed private investigation and private detective services, to businesses and individuals in California and beyond. Our clients include law firms, insurance companies, major corporations and small businesses.
Our California-based private investigations, and our private detectives, also provide many services to private individuals. Our work for individuals includes confidential marital infidelity cases, child custody cases and nanny surveillance.
Our staff includes police-trained, seasoned professional investigators, document experts, interview experts, and industry experts in the credit, collections, lending, and legal fields.
We investigate online and offline. If you have a hunch, we can check it out and find the truth – as we have done for so many clients.