If minor girls can obtain birth control devices from school without parental knowledge because "kids are sexually active and getting pregnant" and the government should step in and supersede parental medical authority over children, it's no wonder there is a nanny state fixation on student BMIs. The government (following its logic) should track children's BMI so the parents (the legal guardians of such children) can realize their children are not measuring up to the fitness scale.
Schools are not medical facilities (at least that is not their stated primary function) and they should not be measuring children without parental knowledge/permission and the information collected might not be correct. Here's a story from myfoxboston.com about a letter going home to a 10 year old boy from the school stating he was obese, when he is not:
Imagine getting a letter from your child's school and opening it up to find that school officials say your child is obese. One such letter was sent to parents of a 10-year-old, active North Andover boy, and they were not too pleased.
The letter, which was sent home to children in select grades throughout the state, detailed the students' height, weight, and body fat percentage after school screenings which were conducted per state law.
When Cameron Watson's parents first received the letter, they crumpled it up. Cameron, a fourth-grade student, plays football, practices martial arts, and wrestles.
According to his parents, he practices several times a week. In fact, this weekend he is wrestling in the state finals and must weigh in at 95 pounds.