Why is airport security important?
What is airport security used for?
Transportation Security Administration (TSA) screeners at airports check passengers and personal items for dangerous items such as weapons, chemicals and liquids that are not allowed as carry-on items. They use screening equipment such as metal detectors, millimeter wave machines, backscatter x-ray and cabinet x-ray machines. These devices also detect items that may be hidden.

The various types of screening equipment used at airports today each have a different screening purpose.