one limmitation of computer tomography scanning technology is that bags are scanned too slowly
this means only bags from suspicious passengers are scanned
since this is not that effective 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