Amazon has been planning upon the use of drones for delivery for packages to buyers under Amazon Prime Air Service. But at least three other groups have already tried the same technology. Domino’s pizza’s domicopter and Taco Bell’s Tacocopter have so far not succeeded in launching their airborne delivery machines. But the most interesting one is Seattle’s city police department’s experimental drone program to enforce public safety mechanism in a completely new fashion. They purchased two Dragonflyer X-6 helicopter Tech unmanned aerial vehicles in 2010. Neither the city council nor the public knew of the police drone program until 2012.