Speaking of big brother ...

The U.S. Department of Homeland Security (DHS) knows the AS&E Advantage. Multiple agencies within DHS deploy the Z Backscatter Van for counterterrorism applications. A breakthrough in X-ray detection technology, AS&E's Z Backscatter Van (ZBV) is a low-cost, extremely maneuverable screening system built into a commercially available delivery van. The ZBV allows for immediate deployment in response to security threats, and its high throughput capability facilitates rapid inspections. The system's unique "drive-by" capability allows one or two operators to conduct X-ray imaging of suspect vehicles and objects while the ZBV drives past.

AS&E

It violates your right to privacy and doesn't even have to stop. Why you can just pass by a vehicle on the street and have your rights violated with neither muss nor fuss.

I heard somewhere that this back scatter device can fit in a suit case. I think it was on the local news a couple of years ago. No, maybe it was on CNN, or both. Heck, maybe it was PBS. I'm not sure how people expect to keep off the shelf stuff quite in this day and age.