A new principal searches an 11-year-old female student's purse, jacket, and jean pockets for illegal drugs. No illegal drugs were found. The student's parents bring suit charging that the search violated their daughter's right to be free of unreasonable search of her person and property. Which of the following best describes the principal who searched the 11-year-old student for illegal drugs after the parents filed suit:

Plaintiff

Qualified immunity

Defendant

Guilty