State law addresses body mass index screening or requires height AND weight measurement.
The Pennsylvania Code § 23.7. Height and weight measurements.
(a) Height and weight measurement shall be conducted at least once annually and preferably twice annually. Every effort shall be made to determine the pattern of growth for each child so that his weight and height can be interpreted in light of his own growth pattern rather than those of his classmates.
(b) Height and weight measurements shall be conducted by a nurse or teacher.