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.
To be clear, there is no one specific test, scan, or anything else of the sort that you can do to determine whether or not you need CBD oil for pain. Also, since cannabis is not yet recognized by the FDA, you unfortunately can’t really go to your doctor either and have them recommend it; until marijuana is FDA-approved, it cannot be prescribed by physicians.
CBD oil is prohibited for sale by terms of service on the major online marketplaces, including Amazon, eBay, and Groupon. Most of the products sold as CBD oil on those websites are hemp seed oil and don't contain any CBD. We've also heard many reports of counterfeit and potentially dangerous products being sold as CBD oil on those websites. Your best bet is to always buy directly from the CBD company's official website.