"San Pedro and the other columnar mescaline-containing cacti are not specifically scheduled, but they contain the controlled substance mescaline. Mescaline is a Schedule I substance in the U.S. Because of their ubiquitous availability through nurseries and major plant vendors across the country, as well as in arboretums and on government property, simple possession of columnar mescaline-containing cacti with no intent to ingest is de facto legal. Sellers (or anyone) who represent the cactus as a source of mescaline or sell them for their psychoactive properties (for "getting high") are at far higher risk of prosecution. Any preparation of the cactus for ingestion would likely turn the plant into a clearly scheduled (illegal) material. We are not aware of any convictions for the possession or sale of non-peyote mescaline-containing cacti such as San Pedro, but this does not mean that the cacti are "legal", it just means that the cactus has not been considered a problem and is currently not treated as a controlled plant by the police. For more information, see Discussion of the US Legal Status of Non-Peyote Mescaline-Containing Cacti."http://www.erowid.org/plants/cacti/cacti_law1.shtml <a target="_blank" href= "http://www.erowid.org/plants/cacti/cacti_law1.shtml">br http://www.erowid.org/plants/cacti/cacti_law1.shtml</a> Does this mean that at any time the government could make these plants illegal to posses, or anything like that?