The controlled substances in question are typically banned or scheduled on a case-by-case basis as the governments catch up with what the latest substance being used is. However, there can be complications with analog drug acts that are in force on the federal level and several states. The Federal Analog Act is a law that has serious concerns with its vague language along with the serious weakness of being limited to banning substances intended for "internal use".
Typically, there is no law for a specific license to sell bath salts, plant feeders, incense, or potpourri among the states. These goods are too prolific for effective enforcement of licenses. The common practice is to ban the substances in the goods. These can be identified by chemical tests and is a lot less burdensome than asking every general goods store to have a license for a handful of products.
Bill No: H.B. 121, Action: 2011-03-16 - Signed by Governor, Link
Bill No: HB481, Action: 2012-04-11 - Signed by Governor (Acts ch. 108), Link
Our herbal blends, bath salts and pills are completely compliant to Kentucky state laws and Federal laws and possession, sale, import, export below mentioned products is completely lawful: