- Advantage Group
- AGR Detective Agency
- Alpha Detective Agency
- Collettes Consultants
- Corporate Intelligence Intl
- David Groover & Assoc
- Gemini Group Investigation
- Jeffrey J Cohen Investigations
- Jim Mercer Investigations
- Jim Thomas & Assoc
- NWL
- Professional Investigators
- Professional Investigators
- Robert D Lawson Investigator
- Whitney Investigations
