At least 18 people have been arrested in an alleged synthetic marijuana production and distribution ring operating in Texas and Oklahoma.
Federal investigators say the cases involve synthetic marijuana and bath salts sold in San Antonio, Houston, Austin, Dallas and Laredo, plus Oklahoma City and Tulsa, Okla.
Prosecutors say a five-count federal indictment unsealed Wednesday in Austin charges six people with conspiracy to possess with intent to distribute synthetic marijuana -- known as cannabinoids.
A criminal complaint filed in San Antonio names 19 suspects facing the same charge.
The defendants include the operators of some tobacco, smoke shop and convenience stores.