Why did Dr. Thurman call Donnie's parents on the night of the party?

from Movie FAQ – Donnie Darko on Rap Genius

Meaning

In Donnie’s previous session with her, he admitted to vandalizing his school and burning down Jim Cunningham’s house.

Dr. Thurman had to tell his parents that Donnie had committed a crime, as by law. It’s believed that the session was the day before the party, although no explicit timeframe is given. If a minor confesses to a teacher or counselor that he has committed a crime in which no one was hurt, the adult must contact the child’s parent.

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