The minor was found to have trespassed on school property after having been suspended from school, in violation of Penal Code section 626.2. On appeal, he argued that there was insufficient evidence that he had been sent the notice of suspension by certified or registered mail. The appellate court agreed and reversed. The plain language of section 626.2 requires written notice of suspension by certified or registered mail. Here, there was no substantial evidence that the notice of suspension was served by certified or registered mail, and therefore reversal was required.