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http://www.youtube.com/watch?v=a9KZ3jgbbmIAs spectacular as the footage may be, there are potential hazards (even if the said "drone" was a "toy" helicopter), as well as potential legal issues (even if there wasn't an incident involving an injury or property damage). I would certainly hope for the sake of the people who filmed this, that they got the necessary clearances for authorities to pull this off -- or otherwise be prepared to face legal consequences *if* in the remote chance that there was some personal injury or property damage as a result of an accident.
Even a "toy" helicopter could become deadly if you're not careful...
http://www.nydailynews.com/new-york/queens/teen-killed-remote-controlled-helicopter-slices-throat-article-1.1447068... it appears that this guy *wasn't* a novice -- but he still made a serious mistake. Not to say that one should ban such things, but operators should not take it lightly "just because" it is considered a "toy" -- they should operate them responsibly and make sure they're operating them as safely as possible.