> Apparently, the recommended cutoff level of THC is 50 ng/mL to pass a drug test, according to SAMHSA. U.S. Drug Test Centers also point out that "most employers and legal services prefer to use SAMHSA-certified labs as the standard since it’s more likely to hold up in court. Most hemp oil or CBD products are usually sold with much lower levels of THC (compared to marijuana), so most CBD consumers won’t have trouble passing a drug test."