It is still unacceptable for any DOT safety sensitive employee subject to DOT’s drug testing regulations to use marijuana. Furthermore, 49 CFR Part 40 does not authorize the use of any Schedule I drug including marijuana for any reason and the use of CBD is not a legitimate medical explanation for laboratory confirmed positive test results for marijuana. It is important to understand that using “marijuana free” CDB products may cause a positive result if the product contains 0.3% of THC in the product. Buyer beware when purchasing these products.