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Airport screening was established in the Usa in January 1973. The equipment was primitive in comparison with today’s screening tools. Since then the equipment was improved and new technology was developed.
Introduced in 1972 the walk-through metal detector has become a standard screening tool at airports. This equipment has provided high quality detection but it has some disadvantages. The alarm system remains unchanged. Security agent must constantly watch and listen for an alarm to ensure detection. At busy airports there are multiple units resulting in multiple alarms and it is easy for a screener to become confused as to which unit has sounded an alarm. It is not only confusing for the operator but also noisy and confusing for passengers.
Some time later another equipment was offered by manufactures, that is a gate system. If no metal is detected the gate remains open. But if metal is detected the gate operates to divert the passenger to a secondary screening point.
The primary tool for searching hand luggage is the X-ray machine. The system operator must be well-trained to identify not only guns and knives, but improvised explosive devices. Many dangerous items cannot be identified with X-ray technology. This is because basic X-ray images only show shadows. Many dangerous items cannot be identified solely with X-ray equipment. If an operator clearly sees and identifies dangerous item the only way is to open the bags and to conduct a hand search.
Another security equipment, called Explosives Trace Detector (ETD) was installed at some airports. ETD is easier to use than any other screening equipment because all that is required of the operator is to take a sample. The equipment automatically analyzes this sample and notifies the operator when explosive item is detected.
One more equipment for screening checked baggage was installed at many airports. It is the Explosives Detection System (EDS). EDS technology is extremely effective in the detection of the presence of explosives.
The latest security systems such as Machine Readable Travel Documents and biometric identification are being introduced at many airports to prevent civil aviation from becoming a terrorist target and to provide absolute security for air passengers.
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