Since this is not that effective, never high-tech system have been developed that are capable of detecting chemical components in individual items.the x-ray scanners most people see in airports are for screening carry-on bags. But these scanners are too small to scan all the luggage that goes into the cargo section of the plane. In busy airports, large trucks with built-in X-ray scanners (up to 5~7 meters long ) are used. These trucks pull up beside containers that hold the suitcases, bags and other cargo. The entire container is scanned at once.