The Ninth Circuit has determined that California’s definition of methamphetamine is broader than the federal definition of methamphetamine because it includes geometric isomers, which are explicitly excluded from the Controlled Substances Act. As such, California convictions involving methamphetamine should no longer qualify as controlled substance violations, drug trafficking aggravated felonies, or reasons to believe that an individual has engaged in drug trafficking.
The full text of Lorenzo v. Sessions can be found here:
http://cdn.ca9.uscourts.gov/datastore/opinions/2018/08/29/15-70814.pdf