Serious potential Big Brother abuse, closely akin to health care clinics in the school setting where parental permissions aren't necessary sought, where your kids are examined for signs of physical (and mental) abuse, and where your kids are quizzed about you and your un-PC activities (such as gun ownership). Then CPS can decide to pay you a visit.
Or your kid can be put on Ritalin at their discretion, etc.
Watch for the Obesity Patrol -- coming SOON to a school near you.