Thermal imaging resolution will probably improve the the spectrum of which they work on wont, allot of common materials today block infrared radiation. 60+ years from now materials being made of silicon, mylar, and all matter of other naturally water tight heat dissipating materials will become even more ubiquitous than they are today. A rating 6 thermal damping is obviously something you would intentionally have to put into your clothes, and on a search would incite allot of questions, but small levels of heat distribution wouldn't be difficult to accomplish at all, even accidently by insulated clothing. On the other end are things like magnetic diffusion shielding, which have the obvious purpose of hiding things from scans, these are forbidden even though the same materials would have scientific application in isolating background noise. However, you have things like NanoCleansers, which could be used to smuggle bombs with ease, and they are only restricted.
Do you see how the F and R thing doesn't always make sense? Even so, these are only the laws for Seattle, not the world on a whole.