one limitation of CT scanning technology is that bags are scanned too slowly this means only bags from suspicious passengers are scanned Since this is not that effective newer high- tech systems have been developed that are capable of detecting chemical components in individual items the X-ray scanners most people see in airport 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 airport 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