In this March, 28, 2012, photo, Mark Harrison, right, and Andreas Oesterer, left, prepare their drones for a flight over a waterfront park in Berkeley, Calif. Interest in the domestic use of drones is surging among public agencies and private citizens alike, including a thriving subculture of amateur hobbyists, even as the prospect of countless tiny but powerful eyes circling in the skies raises serious privacy concerns. (AP Photo/Eric Risberg)