One key factor in the potential for a positive drug test is the source of the CBD product. CBD derived from hemp, which contains less than 0.3% THC by dry weight according to US federal law, is generally considered less likely to cause a positive result compared to CBD derived from marijuana, which can contain higher levels of THC. However, even hemp-derived CBD products may still contain trace amounts of THC, especially if not properly processed or if the manufacturer uses low-quality hemp.