1) There should be no problem so long as the area in which the testing is conducted is either public property or private property held open for use by the public [and maybe even the proverbial "open field"]. To distinguish this matter from pot-growing in an Oregon home, you have to smoke pot or have your car hit by a stoned motorist before there is any risk of harm to you [the first is your own assumed risk and the latter, well, if Mr. Stoned Motorist is driving in an aberrant manner, that's probable cause for a stop and some inquiry and the risk of harm may thereby be eliminated]. Radiation "breezing" through the neighborhood is a whole other matter, since unless one has the necessary machinery, one will never know that one will soon be glowing in the dark and sprouting that third arm. I would otherwise submit that this matter is more like Illinois v. Caballes than Kyllo. Please see:
http://www.law.cornell.edu/supct/html/03-923.ZS.html"Held: A dog sniff conducted during a concededly lawful traffic stop that reveals no information other than the location of a substance that no individual has any right to possess does not violate the Fourth Amendment. Pp. 2—4."
The problem with the heat imaging device is that it might also disclose LAWFUL information. The only lawful information that might possibly be communicated here concerns those undergoing chemo/radiation-therapy, and all "the man" would know is that you are undergoing chemo/radiation-therapy. And it was on precisely this basis that the Supremes distinguished Kyllo:
"Critical to that decision was the fact that the device was capable of detecting lawful activity -- in that case, intimate details in a home, such as "at what hour each night the lady of the house takes her daily sauna and bath." The legitimate expectation that information about perfectly lawful activity will remain private is categorically distinguishable from respondent's hopes or expectations concerning the nondetection of contraband in the trunk of his car. A dog sniff conducted during a concededly lawful traffic stop that reveals no information other than the location of a substance that no individual has any right to possess does not violate the Fourth Amendment."
That was the polite way of saying that drug-sniffing dogs are one thing, but pervs with heat imaging devices getting their rocks off while watching the heat image of you and yours during lovemaking is entirely another. And as some blogger aptly put it, if the cops and science could come up with a heat imaging device that only imaged the heat from marijuana plants, then Kyllo would be distinguished, since no one has a reasonable expectation of privacy regarding their possession of illegal contraband.
And for the icing on the proverbial cake, in US v. Place, the Supremes held that a trained drug-sniffing dog is unique in that the only use for the same is to detect the presence of narcotics and so there was no reasonable expectation of privacy re the same.
2) The FBI should conduct the same monitoring whenever the same appears to be reasonable to them.
3) I would hope that we are already conducting such tests in other locales such as airports and at sporting events.
Edited to add:
http://caselaw.lp.findlaw.com/scripts/getc...l=462&invol=696"...The investigative procedure of subjecting luggage to a "sniff test" by a well-trained narcotics detection dog does not constitute a "search" within the meaning of the Fourth Amendment. Pp. 706-707. "