In 1970, the U.S. government passed the Controlled Substances Act, a statute that regulates all cannabis, including industrial hemp. However, the definition of marijuana was lifted from the existing 1937 statute and adopted without any change. This definition excluded certain parts of hemp — sterilized hemp seed, hemp fiber, and hemp seed oil — from regulation.
Drug tests test for THC. That is the chemical that creates the high in marijuana. CBD is not illegal and isn’t on standard drug screening tests. Hope that helps. I’m in pain management and looked into this before trying it. I didn’t feel any effect on my pain but I also have only tried it once or twice when a friend had some. I did notice that it helped me to relax and become less anxious.

Once the plants are harvested, the next step is to extract the CBD. One commonly used method is alcohol extraction, where the plant is soaked in a grain alcohol solvent. After it is soaked, the liquid that remains is high in CBD. The solvent is then evaporated and voila! You are left with potent CBD oil. CO2 extraction is another common method, but it is much more complex. 
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