SAVANNAH, Ga. (AP) _ Narcotics agents in Savannah and Chatham County have begun hand-delivering letters to more than 200 gas stations, convenience stores and other businesses, warning them that some over-the-counter items have been banned under state and federal laws.

The Savannah Morning News reports that the items include a brand of synthetic marijuana known as “Spice” and some products known as bath salts.

The letters, delivered by the city and county narcotics unit, urge businesses to discontinue selling the items and avoid them in the future.

Narcotics agents say they’re hoping that by delivering the letters, the products will disappear from store shelves.

The letters warn store owners that they could face up to 30 years in prison for selling controlled substances.

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Information from: Savannah Morning News, http://www.savannahnow.com