As drone expert, P.W. Singer said about microdrones, At this point, it doesnt really matter if you are against the technology, because its coming. According to Singer, The miniaturization of drones is where it really gets interesting. You can use these things anywhere, put them anyplace, and the target will never even know theyre being watched.
This has been the promise that the Air Force made quite clear in their video early last year about nanodrone tech that you can see below. According to the USAF, Micro Air Vehicles (MAVs), combined with the ability to harvest energy, will enable insect-sized drone swarms to be dropped from military aircraft to stay aloft for a prolonged amount of time, offering a host of functions, including assassination.