The Fifth Circuit has determined that Texas Health & Safety Code Penalty Group 2A contains at least one substance not listed in the federal drug statutes. Moreover, the court found no case law or statutory indicators that the substances are elements of the offense, and thus, concluded that the statute is indivisible. The court remanded for the agency to determine if there is a realistic probability that Texas prosecutes offenses involving the drug not listed in the federal schedules.
The full text of Alejos-Perez v. Garland can be found here:
https://www.ca5.uscourts.gov/opinions/pub/19/19-60256-CV0.pdf