WASHINGTON (AP) — The Supreme Court agreed Monday to hear an appeal from a CBD hemp oil maker fighting a lawsuit from a truck driver who says he got fired after using a product falsely advertised as being free from marijuana’s active ingredient.

Douglas Horn says he took the product to help with chronic shoulder and back pain he had after a serious accident. The company said it contained CBD, a generally legal compound that is widely sold as a dietary supplement and included in personal-care products, but not THC, which gives marijuana its high, Horn said in court documents.

After a failed routine drug test got him fired, Horn says he confirmed with a lab that the product did have THC. He sued the Vista, California, company under the Racketeer Influenced and Corrupt Organizations Act, among other claims, alleging the THC-free marketing amounted to fraud.