With the accidental (and apparently innocent) crash of a DJI Phantom quadcopter on the White House lawn, there’s an urgency to the question of how the Secret Service can defend against a small drone that’s been launched with malicious intent.  The key is malicious — people who are actively hoping to evade detection (otherwise, rule and regulations will suffice, no?).  There’s two problems to solve, really.  The first is detection, and the second is stopping a drone.

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