On this. but i can tell you from what we see, is that it does work, but we also ought to be very careful, when it comes to something like pills, because you are talking for about the amount of fentanyl that is deadly. it's the amount that can be on the tip of a pencil, there is no way to scrape off a piece of a pill, and use of fentanyl test trip, and know that pillow straight safe. >> he can just rub a little bit of a pill. >> so you'd have to crash the bill, and dissolve in water. it wouldn't that nullify -- somebody wants to use officials, what they do that? >> so, these are important parts...