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.
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