http://www.kansascity.com/mld/kansascity/11655512.htm
Do you suppose the teachers stand there with a stopwatch? What's the legal definition of "lingering"?
This reminded me of the kid suspended for talking to his mom on a cell phone. In both cases you've got a rule that seems to go beyond its stated purpose, compounded by willful youthful disobedience.
I'm willing to cut schools a lot of slack, but perhaps they need to figure out less-draconian ways to maintain focus and discipline.