The Ninth Circuit has determined that the Federal First Offender Act applies to two convictions for simple possession of a controlled substance arising out of the same event. Thus, the court applied the ameliorative effects of the Act to an immigrant who was convicted of possession of marijuana and possession of methamphetamine at the same time in the same criminal case.
The full text of Villavicencio-Rojas v. Lynch can be found here: http://cdn.ca9.uscourts.gov/datastore/opinions/2016/02/02/13-70620.pdf