Since this is not that effective , newer high-tech systems have been develops that are capable of detecting chemical components in individual items
This 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.