Join Your DOT Guy, Brian Riker and his special guest, Kathryn Riker, a Quality and Compliance specialist for a cannabis testing lab in California as they discuss all things THC, including why those easy to buy over-the-counter CBD products can cause you to test positive for marijuana use on your DOT drug testing. This is a must listen if you have any questions about why it is so difficult to get true 0% THC products and how a DOT drug test can come back positive even with legal use of CBD products.