Yes — the parental release authorizes the school to receive all treatment information.

It depends on the regulatory framework. If the treatment program is subject to 42 CFR Part 2 (which applies to federally assisted substance use disorder programs), Part 2 requires a specific written consent more restrictive than a standard HIPAA authorization. Even outside Part 2, state laws may impose additional protections on adolescent substance use treatment records. A general parental release may be insufficient under either framework.

Yes, but only the diagnosis and not the treatment details.

Yes, because the school counselor is an educational professional acting in the student's interest.