Check out this NPR story, on Colorado Schools banning the playing of tag at school.
NPR:This happening around the country, here's a blog post from last year on similar doings outside of Boston.
"Schools are finding more ways to protect your kids. Some schools limit the sodas kids may buy. Other schools say dodge ball is too dangerous. Now the Discovery Canyon Campus School in Colorado Springs, Colorado is banning tag. Officials say the game can lead to harassment. The assistant principal says students can still run; they just can't chase anybody. With that danger eliminated, kids have nothing to worry about except drugs, guns, and growing up."
Sometimes you can't make this stuff up.