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Looks like the "through steel" part was edited out, but still skeptical of this technology in general, particularly like as if it would be used to affect us (ordering a few vials internationally for personal use)
I'll save you the time of calling me naïve. Perhaps.
Yeah I had the specs up of the gantry device that will be used to scan cargo containers, penetrates 12.6" of steel to be specific:
Mail will be scanned using Dual Energy Computed Tomography. Using two different X-ray energy levels, the differential can be compared to determine the atomic number of the material the beams are focused on. Tomography uses precision beam placement to generate a detailed 3d model built up of scanned high resolution "slices".
This isn't brand new tech, but processing all that data in realtime was very limited until recently, and was used to create color coded images, distinguishing between various materials, for viewing by the equipment operator. Some systems could flag a very limited number of materials, like explosives, and highlight them for the operator's attention.
Now, a known sample can be scanned to generate a package of "rich data", say, 20GB worth for something the size of a vial of trenbalone, running it through an AI based system that creates a model which allows similar items to be identified with far less processing power so the system can identify it in real time. Once contraband is detected, a "Tray return system" shifts the package off the processing line for customs personnel to deal with.
Resolution is high enough that a bag with mixed milk powder and sugar can have both substances accurately identified.
The library of models is constantly growing, of course. Because there are so many different systems employing this technology, there are proposals to standardize model formats so custom's agencies around the world can share models for use regardless of the equipment being used.
Enforcement policy may be in question, the technology is not.