Developing tightly coupled machine-insect interfaces by placing micro-mechanical systems inside the insects during the early stages of metamorphosis.Developed for use by the military for all kinds of weird, creepy reasons, it's possibly they are now being used by the NYPD for surveillance, as shown in the photo above, riding on the 6 train.
NYC The Blog got a close look at the fly, attempting to get a visual of any robotic parts, metal, or tiny cameras, and could not actually confirm the existence of any of that. The fly however, was not concerned at all by our presence, and seemed to be playing it extra cool. He did not fly away. It seemed really sketchy.
If it was not a Darpa Bug, they will surely become a common surveillance tool, so get used to them.