Turn off your cellphones, a woman yells to a courtroom full of teenagers.
"I'm not going to tell you again," she scolds them.
The group snickers, hiding their cellphones and iPods until the woman walks away.
All rise.
Court has begun. But this is no ordinary courtroom. The bailiff, jury, prosecutor and defense attorneys are all teenagers overseeing the fate of their peers -- some for stealing a case of beer and others for speeding tickets
