Scanning an HGV for illegal contents - GIF

Scanning an HGV for illegal contents.

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Previously:

3D scanning objects for 3D printing - GIF and photo
Automated car body scanning and inspection machine - video
CAT scan machine spinning without cover
Coronavirus body temp scanner in police helmet - GIF
Laser scanning portioner - GIF
Optical scanning inspection train - GIF

I wonder what the resolution is? How small of a item can be detected or is it sensing radiation?

I think dogs would be cheaper.