( KTRS ) A man has been sentenced to more than 12 years in prison for conspiring to make and sell synthetic drugs.

Richard Gross of Winfield pleaded guilty to four federal charges in April. Prosecutors say Gross supplied the homemade drugs to his mother, Pamela Tabatt, who operated two “head shops” in Weldon Spring and in St. Louis County.

The drugs were sold at those stores, packaged as “bath salts” or “incense.”