there is actually a science change that happened, and it's not (entirely) just politicians changing their mind.

The big thing going from X-ray (2d) to CT (spin an X-ray machine around and take a ton of pictures to recreate a 3d image) did a lot to let security people see inside of a bag, but the hitch is that if you see a blob of gray is that water, shampoo or something else?

The recent advance that is letting this happen is machines who will send multiple wavelengths of X-ray through the material: since different materials absorb light differently, your machine can distinguish between materials, which lets you be more sure that that 2litre is (mostly) water, and then they can discriminate

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5d41402abc4b an hour ago | parent | next [-]

Can this X Ray bit flip memory or damage NAND?

	▲	flambeerpeer 6 minutes ago \| parent \| next [-]
		Super Mario 64 airport security speedrun strat
	▲	wiredfool 24 minutes ago \| parent \| prev [-]
		It's a specific liquid scanner that's done on bottles that have been pulled aside for extra scanning (at least, that's what Frankfurt was doing a couple weeks ago)

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bleepblap 4 hours ago | parent | prev | next [-]

There's a whole ton of people taking about MRI -- MRIs are a completely universe than CT/X-rays

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DaiPlusPlus 3 hours ago | parent [-]

I think if an MRI was ever used for airport security screening it would cause more damage and disruption than the terrorist bombs it purports to detect.

	▲	bleepblap 3 hours ago \| parent [-]
		It wasn't -- was just noting that people keep saying "MRI", when there's no 5T fields around most security checkpoints

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HNisCIS 4 hours ago | parent | prev [-]

Dual energy x ray has been around forever though, like decades.

	▲	bleepblap 3 hours ago \| parent [-]
		Certainly, but a) not at the prices people wanted to spend to get 25,000 of them b) not at the maintenance cost for 25,000 of them c) without the software to (by someone's metric) discriminate between shampoo and bomb with enough error