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Comment by jbellis | Hacker News Reader

Not because of a sudden outbreak of sanity, but because they have CT scanners now.

3-1-1 is rarely enforced. I always got confused why the 100ml limit existed, since I could just take multiple bottles of 100ml of whatever I wanted and it was okay. Then I realized that technically I only could take 3 bottles but I’ve been getting away with more for decades.

It's not 3 bottles, it's 3.4 oz or 100 ml.

isn't it whatever fits in a quart-sized ziploc? i presume that's where the other poster estimated "only 3 bottles."

3-1-1 is an awful mnemonic, but it's basically: 3.4 oz containers in 1 1-quart ziplock bag.

I guess the comms people got their hands on it before they deployed the original mnemonic: 3.4-1-1

Then you hide them somewhere inside and go back out and in again

OR, you just have one or more accomplices ;-)

It’s as many bottles sized 100ml or less that you can fit in a 1 liter bag.

Yeah, but arent you allowed to exit and re-enter security as many times as you like as long as you have a valid ticket?

They'd probably find it suspicious

> Not because of a sudden outbreak of sanity, but because they have CT scanners now.

What's is the evidence for believing so strongly that airports all over the world have been prohibiting large amounts of liquids due to widespread insanity?

Yeah, I flew thru Eindhoven Airport in the Netherlands a few years ago, and I couldn't believe they let me through with water.

The security used something I would describe as out of an Iron Man film, they were zooming around a translucent 3D view of my backpack. (It was on an LCD display instead of hovering midair, but I was still impressed. But the fact they let me keep the water was even more amazing, hahah.)

I've seen this too in the US, the newer machines let them spin the scan around in 3D space and must make it much easier to tell if something needs inspection or not

Yeah these are pretty common in the US, but they're just not ubiquitous. Many airports will still have a CT machine next to the old one and it just depends on what line you get out in.

> The security used something I would describe as out of an Iron Man film, they were zooming around a translucent 3D view of my backpack. (It was on an LCD display instead of hovering midair, but I was still impressed.

I just flew with two laptops in my backpack which I didn't have to take out for the first time (haven't flown in a while), with a custom PCB with a couple of vivaldi antennas sandwiched in between the laptops.

It was a real trip watching them view the three PCBs as a single stack, then automatically separate them out, and rotate them individually in 3D. The scanner threw some kind of warning and the operator asked me what the custom PCB was, so I had to explain to them it was a ground penetrating radar (that didn't go over well; I had to check the bag)

You can do realtime 3D flythroughs on CT scans with open source viewers. If you've ever had one, get your DICOM data set and enjoy living in the future.

Can you recommend one? I've tried Aeskulap and Amide and I found it hard to get the 3D views to work.

Inveselius works well. The UI lacks some polish but the rendering beats what most physicians have access to.

Tel Aviv has allowing this for quite some time (10 years?). I guess they update their security devices as soon as new technology becomes available.

They don't advertise it, I found out by accident, trying to empty my water bottle by drinking when a security person told me to just put it together with the rest of my stuff. I had no idea that was a thing and was pretty confused.

They’re multi wavelength CT. Basically whenever you see a 4:3 box with a “smiths” logo over the belt it’s going to be a pretty painless process (take nothing out except analog film)

I would say just as if not more important are probably some advanced nitrates detector.

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