Since when? I want documentation.
See http://nielsolson.us/Photography/PhotoLaw.html in particular, about a third of the way down the page is a link to a PDF called “The Photographer’s Right”
The Patriot Act makes it a crime to gather information in the furtherance of a terrorist attack. The burden of proof is shifted to the defendant to prove he WAS NOT engaging in such, rather than making the state prove beyond a reasonable doubt that the subject was in fact gathering intel to assist such an act. So what we have HE-AH is a failu-AH to communicate! The patriot Act lowered the level of scrutiny for LAW ENFORCEMENT operations to interdict terror operations on our soil in the name of national security. Remember, too that an international airport isn't just private property it is FEDERAL Property under federal rules, federal jurisdiction and federal rules of criminal procedure. I'm not sure, but I'll bet that local police officers that are assigned duties on airport property have federal authority to detain or arrest under the Patriot Act. While it may not be specified therein, it probably would fall under the necessary and proper clause (aka the elastic clause) under article one, section eight of the Constitution. But that's just a guess.