WASHINGTON (PNN) - May 1, 2013 - Worried about drones spying on you? Soon, a device might be able to send you text and email alerts that let you know when a drone is nearby.
A Washington, D.C.-based engineer is working on the "Drone Shield," a small, Wi-Fi-connected device that uses a microphone to detect a drone's "acoustic signatures" (sound frequency and spectrum) when it's within range.













