An insect spy drone is already in production according to various internet sources. This robotic insect can be controlled from a great distance and is equipped with a camera and a built-in microphone.
It has the capability to fly remotely and land on your skin, like a real mosquito, and use it’s super-micron sized needle to take your DNA sample. All you feel is the pain of a mosquito bite (without the burning sensation and the swelling ofcourse).
This device can also inject a micro RFID tracking device, right under your skin, without you feeling nothing more than a small bite.
More here: http://www.e-cloudy.com/2012/06/insect-spy-drones-in-production/