Can't answer for the USA but the EU countries are held to a minimum standard and anything above and beyond that is their business. We were detained in charles de gaulle for having explosive traces detected. Yet, we just transited Frankfurt without a hitch.
I see what you're getting at and would only add that everybody be subjected to additional screening. No room to whine.
As for grandma, older folks, especially in wheel chairs, are too easy to use. We've already had an incident involving a wheelchair with drugs stuffed into the tires and frame.
Regards, Stan
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