I believe the article mentioned density as well. I suspect that is extremely key in determining what it is, or at least determining if it is something really odd that should get additional screening.

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mjevans 5 hours ago | parent [-]

So they'll still make me toss out my dang sunscreen.

	▲	greazy 5 hours ago \| parent [-]
		No, they'd make you take it out if the scanner / person is unable to classify the object.