can you have outside sales force investigated without their knowledge

Anthony,

Your question really is outside of my area of knowledge.

From a practical standpoint, I can think of no reason why the conduct you describe would be illegal or improper.

Also, a Private Investigator must be licensed by the State of California, and I do not believe someone would accept an illegal assignment, since they could lose the license.

You might contact the agency that provides a license to Private Investigators to ask the question. The agency is the State Department of Consumer Affairs, and you can click the link below for more information, or to file a complaint:

http://www.dca.ca.gov/complainthelp/complfrm.htm

Good luck to you,

J. Carlos Fox