whitney teacher matthew yamamoto was arrested in september 2012 on suspicion of molesting an underage student. the school district waited two days after the arrest before informing parents. in 2013, yamamoto pleaded no contest to oral copulation with a minor, attempted sexual intercourse with a minor and sexual penetration with a foreign object on a minor, and pleaded guilty to one felony count of conspiracy to obstruct justice. he received the maximum sentence of five years in prison, in light of his violation of a restraining order during the investigation.