After reading this, I'm not so sure I want to do this anymore.
St. Louis County lawsuit is 'cautionary tale' on obscuring taillights : News
JPunisher
I'm a little worried about the law myself. I didn't think about it until I installed them, then I looked up Iowa code. It says it's illegal to modify stock lighting systems. That's an invitation to troopers? Anyway, I'll report back if I have any hassles.