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I predict that some cities will eventually desire persistent aerial surveillance systems like http://www.baesystems.com/product/BAES_162772/ARGUS-IS http://www.baesystems.com/product/BAES_162772/ARGUS-IS for many reasons, this being one. The best way to tell who is operating a drone may be to play wide-area surveillance video backward and trace the drone back to where it was launched. Wide-area surveillance is a slightly scary technology. But it may be more good than bad if used appropriately.