The U.S. created the so called "SAFETY ACT" to exempt manufacturers from liability related to harm their technologies cause to the public. They wanted this because they have these "driveby x-rays machines" in vans and crap now, they basically can drive beside your car on the road and x-ray your car/children/etc/etc ... sick crap honestly.

According to various sources and the rapescan website, their primary scanning device was approved for liability immunity (insurance capped) in 2006.

I hate to link to this site but it has the most simple explanation.
http://forum.prisonplanet.com/index.php?topic=204181.0

http://en.wikipedia.org/wiki/Backsca...ay#cite_ref-66

So, you know ... want to kill lots of civilians? Build something that kills them, claim it's for 'security purposes', bribe some politicians, apply for listing under the 'SAFETY ACT', get approved, proceed to inflict said damages against the population with immunity from prosecution or liability.