There are only three manufacturers certified by the FAA to provide these systems , one of which is Thermo Detection ( formerly Thermedics ) , which produces the EGIS , a GC-MS-based line of explosives detectors .
There are only three manufacturers certified by the FAA to provide these systems . The first is Thermo Detection ( formerly Thermedics ) , which produces the EGIS , a GC-MS-based line of explosives detectors .