I am a retired lineman, worked for an investor owned utility.  As explained to us in a union meeting, The government told the marijuana industry if their product contained less than .5 (percent?) level of THC, they could advertise "no THC".  HOWEVER, when they tested cdl drivers, they tested down to the .1(percent?) level.  Thus, if you took it for aches and pains, you failed your cdl test. Let the buyer beware.