West Virginia has joined the list of states moving to regulate or ban delta-8 THC.

Sen. Jack Woodrum (R) introduced Senate Bill 666 Feb. 17, which would add the active chemicals in Kratom and delta-8 THC to the Schedule I Controlled Substances list.

According to the National Institute on Drug Abuse (NIDA), Kratom is an herbal extract—typically sold online—that comes from a topical tree (Mitragyna speciosa) grown in Southeast Asia. The leaves of the tree contain “compounds that can have psychotropic (mind-altering) effects,” NIDA reported.

Since the measure was introduced, it has received many public comments from individuals in favor and against the measure. Most commonly, some say they’ve used either substance for medicinal benefits, while others argue that there is not enough scientific research to back those arguments.