Interesting device being tested by Ferguson, MO police. I think it takes precious time away from the officer under threat, but the video claims that it would only be viable for use if the officer has 3 or more seconds. If I were an LEO, I would worry about being second guessed any time I might have to use lethal force, i.e., being asked why I didn't use the less than lethal alternative. And I'm not so sure that it would knock the criminal down as claimed, since even a so-called lethal pistol round clearly does not always disable the person shot. I don't see any potential use by civilian concealed carriers, but who knows what a State legislature might require of us in the future.
http://www.msn.com/en-us/news/us/ice-and-snowfalls-paralyze-central-us/vi-BBhFTAN
http://www.msn.com/en-us/news/us/ice-and-snowfalls-paralyze-central-us/vi-BBhFTAN