Millennium Access Control Technology makes patented access-control systems for jails, prisons, and other secure institutions, with its PACS designed to limit direct contact between correctional staff and violent inmates. Invented by T. Alexander and refined through client feedback, the American-made system has been used in more than 200 correctional facilities, including federal medical centers and major county jail systems. The company also produces high-security equipment such as TV enclosures and a five-way multigym.