With locations in more than 20 states, Security Services of America is one of the top-10 largest security firms in the United States. This full-service private security and investigative firm is structured to meet the increasing demand for professional private security, investigative services and information protection services. Its capabilities include patrol and inspection services, on-site security personnel, retail loss prevention programs, homeland security solutions, employee background screening and a 24-hour dispatch center. The company maintains locations throughout the United States, including one in Joplin, Mo. Security Services of America is a subsidiary of ABM Industries.