I've had the product since December and as of yet haven't had a need for it, so I AM wondering how it works. I do see people say it won't--but based on what? I am looking for someone who has actually used THIS product--not others like it. That's the thing about technology--it gets better. Maybe it doesn't work as well as advertised and marketed--that's what I'm trying to figure out. But if it didn't work at all, why would law enforcement use it, and how would they still be in business??