High-tech Scanners
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 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.