How do the X-ray machines at the airport detect illegal substances inside the luggage?
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The xray scanners, I assume you are referring to are the ones in departures which are for the transport safety side of thjngs. The primary function is to scan for weapons. So as each bag or suitcase passes through the computer attempted to locate anything of a weapon nature, certain laptops and ipads have internal components that are actually detected as firearms by the system (layout of batteries and internals). They will also pick up things such as nerf guns etc.
The ones upon arrival are more operated by that countries customs department.They are use to detect organic matter, organic matter is shown by the xray with a slightly different colour usually an orange type which generally indicates food or drugs. The real method of testing for drugs is with swabs and sniffer dogs. Food on the other hand is checked dependent on the country you are entering.
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