More Than Just a Detective Agency We're a leading traffic control company in South Central Maine Ace Detective & Security Agency has been working to keep the general public safe since 1976, making us one of the oldest agencies in the Lisbon, ME area. Our commitment to safety extends to construction site traffic control, which we provide at competitive rates. We're actively recruiting qualified workers to join our traffic control safety team. If you're interested in working for our traffic control company, visit the Apply Now page to start the application process.