34 CFR §300.174

1. (a)General. The SEA must prohibit State and LEA personnel from requiring parents to obtain a prescription for substances identified under schedules I, II, III, IV, or V in section 202(c) of the Controlled Substances Act (21 U.S.C. 812(c)) for a child as a condition of attending school, receiving an evaluation under §§ 300.300 through 300.311, or receiving services under this part.
2. (b)Rule of construction. Nothing in paragraph (a) of this section shall be construed to create a Federal prohibition against teachers and other school personnel consulting or sharing classroom-based observations with parents or guardians regarding a student's academic and functional performance, or behavior in the classroom or school, or regarding the need for evaluation for special education or related services under § 300.111 (related to child find).