Miami-Dade County has agreed to settle a long-running legal dispute with the Wackenhut security firm, and one of the biggest winners is a Wackenhut worker who blew the whistle on the company. The battle began in 2005 when Michelle Trimble accused her employer of billing the county for 300 hours of work a week that no one was performing. The alleged overbilling amounted to $4.5 million per year.