OKLAHOMA CITY (AP) — The security needs of the exploding medical marijuana industry in Oklahoma has opened doors for entrepreneurs in Oklahoma. Duncan-based Stronghold Protection Group and Oklahoma City-based Hendrickson Investigation & Protection LLC are two companies providing armed security guards and specialized transportation to protect the cash. Stronghold co-owner Clint Gann told The Oklahoman that that he used his trucking and transportation background to work with partner Brendon Davis, who has security experience.Read more on NewsOK.com