Some would cite this as further evidence that the American male is being further feminized while others might say it's simply part of the nanny culture we live in.

CNN: School bans tag, other chase games

Officials at an elementary school south of Boston have banned kids from playing tag, touch football and any other unsupervised chase game during recess for fear they'll get hurt and hold the school liable.

Recess is "a time when accidents can happen," said Willett Elementary School Principal Gaylene Heppe, who approved the ban.

There's even a semi-local angle.

Elementary schools in Cheyenne, Wyoming, and Spokane, Washington, also recently banned tag during recess.

I looked for more articles on the subject and found this posted on Michelle Malkin's blog:

Massachussetts–the state that once spawned enough tax rebels to shuck off the crown and create a whole new country is now home to a school that has banned tag.

You can vote at KIRO's website on whether you think tag should be allowed during recess. Internet polling is far from scientific (though interesting) so take a heavy dose of salt, but the vote is currently running 95-5 in favor of allowing tag (and I presume other contact activities).