So it really depends on what you are looking for. If you are looking for say, stowaways in a truck, backscatter x-ray is sufficient to help you find them. But i

So it really depends on what you are looking for. If you are looking for say, stowaways in a truck, backscatter x-ray is sufficient to help you find them. But if you are looking for smuggled goods you might need some sort of tranmissive x-ray system the truck passes through like a flatbed scanner of sorts.