Looks like traveling with a quadcopter these days will get you held, arrested and listed as a terrorist: http://www.suasnews.com/2012/06/16986/quadcopter-drone-group-held-in-london-airport-on-suspicion-of-terrorism
There's a WAR going on between Cellphone Photographers and the Police! To date it's NOT a crime in the United States to Photograph in public nor is it crime to photograph the Police while in the performance of their duty ... However the typical Police Man on the street don't know this thus think otherwise Check out this URL, this is the kind of thing that Carlos Miller reports ---> http://www.pixiq.com/contributors/carlosmiller Lots of CRAZINESS going on within that URL