From the Associated Press:

WAUSAU, Wis — Cars lining the street. A house full of young people. A keg and drinking games inside. Police thought they had an underage boozing party on their hands.

But though they made dozens of teens take breath tests, none tested positive for alcohol. That’s because the keg contained root beer.

… Nearly 90 breath tests were done, and officers even searched locked rooms for hiding teens…

You never which terrorists might be at these root beer keggers, right?  Reno 911 writers take note.  I’m surprised that the kids weren’t charged with some kind of frivolous charge for not actually breaking the law.