The Ninth Circuit has affirmed that California's controlled statutes are divisible, applying the Supreme Court's decision in Mathis v. United States. Specifically, the court determined that health and safety code section 11351 (possession or purchase for sale of a controlled substance) is divisible with respect to the enumerated controlled substances). As such, the modified categorical approach can be employed to determine which substance the conviction was premised upon.
The full text of US v. Murillo-Alvarado can be found here:
http://cdn.ca9.uscourts.gov/datastore/opinions/2017/12/04/14-50354.pdf