The sad thing about all of this is that the dinguses on the police state side are not evil monsters, they think this is the only way to protect us from some undefined attack, and if a few rights are trampled on the way, well you are going to break a few eggs to make an omelet.
It practically encourages bullies in the police force to take their will out on the people, and there is no real mechanism for justice for the citizens affected. The constant excuse "but it will make you safer!" or "think of the children!" is chanted while more and more of your privacy is eroded.
Any terrorist could simply use non-human intelligence to gather information on most structures of import, or if needed, would have a much better plan to deal with the problem of being identified as someone casing the place.