http://www.katu.com/team2/story.asp?ID=85715
According to the story (May 8th) it's the Barnes Elementary School in Beaverton, OR that has banned tag.
That's the same link that soz posted but before I thought it ended at the graphic.
Caitlin Gable is a great school if you can afford the $14,000 to $20,000 per year tuition. They only have 700 students grade k-12.