Huynh

*685 Defendant Michael Huynh was sentenced to prison after a jury found him guilty of assault with a deadly weapon and other offenses, with gang enhancements. On appeal, he asserts prejudicial discovery violations, error concerning the prosecution's gang expert testimony, and insufficient evidence to support the conviction and gang enhancement for unlawful possession of a billy. For the reasons explained here, defendant has failed to establish prejudicial discovery or evidentiary error, and the conviction for possession of a billy and related gang enhancement are supported by substantial evidence. We will affirm the judgment.

I. BACKGROUND

In March 2012, defendant, then a student at Andrew Hill High School in San Jose, was involved in a fight with another student. Fourteen months later, defendant retaliated against Julian, the student whom he perceived had "jumped" him. On May 8, 2013, defendant, along with four or five other males, chased Julian and two schoolmates, Isaiah and Alvaro, as they were returning to the school campus after lunch, and accosted Julian on Senter Road in front of the school. 1

San Jose Police Officer Paul Guerra interviewed Julian, Isaiah, and Alvaro…