 with your naked eye but researchers discover that every time we lie our pupils dilate a bit. A company called Converis is giving this chance the pupil change a closer look with device called eye detect. They say it can catch somebody in a fib. Conervis says their new lie detector could one day assist police with keeping an eye on crime. Our hope is that our technology can help make us safer and help protect us from those that would want harm. Converis, I think I've said it three different ways so far in this story. They think the pupil change is cause because it takes mental effort to lie. You told the truth? I told the truth so my pupils didn't dilate when I said I butchered their name.