How do the X-ray machines at the airport detect illegal substances inside the luggage?
In: 3
All it does is allow for a human to look inside bags without actually opening them.
It’s not different than unzipping every bag and rifling through it looking for anything against the rules.
When the human thinks they see something suspicious, they flag that bag for a more thorough search.
X-Ray machines don’t detect anything by themselves. They just make searching hundreds of bags faster than doing it all by hand.
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