Labratory and on the field, we've got player feed back from survey, we've gotten athletic trainer feed back from surveys. at the end of the day, you're right, there's no absolute definitive test either in the lab or currently on the field that really accurately measures concussions. it's a very complicated issue. there's an evolving definition of concussions. and as you said, players often don't report what's happening, so it's taking collective information. jenna: some will critical of technology, saying there's a limit to technology, especially in a game like football, because you're getting...