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> The leaving passengers luggage will have to be removed for safety as it could be dangerous.

I really do hope all luggage gets inspected /before/ anyone boards the plane.

I collected those TSA inspected slips when I was flying through SFO a lot. However I did not get one every single time. I suppose time does not allow manually inspecting every 40 pound piece of luggage every passenger brings. Plus luggage does have less strict rules about what you can have in them as opposed to hand luggage which makes it a bigger risk all by itself

It's not a time issue, there's just no need. Radiation-based screening is sufficient most of the time. Physical bag searches happen when the radiation-based screening indicates something or when it cannot produce a clear image. Bags may also be randomly "selected" for a physical search.

The majority of checked baggage is screened without the need for a physical bag search.[0]

[0] https://www.tsa.gov/travel/security-screening

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