BMI is a total waste of time. There is no "one size fits all" measurement to indicate fitness levels just as there shouldn't be a one size fits all educational system.....
If I measured the BMI of my son (6'0", 210 lbs of muscle) his BMI would indicate he is "obese".
These idiots in NY are teaching to the test, the BMI test, and it is rarely accurate because of different fitness levels. BMI is only an indicator and should never be the end all to indicate obesity. I've weaned most of my members off this....it is useless. For my BMI to fall within my suggested range ( I'm 5'9", 175 lbs, 58 years old) I would need to LOSE 20-25 lbs. I'd be gaunt. Sickly looking.
If I were a parent, I would demand all the teachers to have their BMI checked.