Roger, I’m not 100% certain on this, but I’m pretty confident that the difference here (and what makes it legal for people to sell it on Amazon) is that they are ONLY selling Hemp derived CBD vs. Cannabis derived CBD. Hence the “hemp extract” which is why the Farm Bill passing was such a big deal. As far as I’m aware, you can get CBD from both cannabis and hemp, but the hemp is legal federally. The bigger problem that I see is how misleading all of the amazon products are though because of these amazon regulations. All of the bottles I’ve seen only show the amount of “Hemp seed extract” (ex-2,500 mg Hemp Oil Extract) which is just like buying 2,500 mg of orange juice when I’m looking for vitamin c!
In short, CBD oils made from hemp must contain less than 0.3% THC – this is below the legal federal limit (and is why many CBD oil companies claim to be able to ‘legally ship to all 50 U.S. states’). In contrast, cannabis CBD oils (that you’d find in places like medical marijuana dispensaries) may have a much higher THC content, given that they are made from marijuana rather than hemp.
Third-Party Testing: Once a CBD oil is manufactured, CBD oil companies will often submit their products for third-party tests, which are conducted by non-company personnel to ensure the product is safe for public consumption and meets quality standards.CBD oils should always be accompanied with information about third-party tests; best practice is to avoid oils that do not supply these details.
To make matters worse, many of the third parties selling hemp seed oil on Amazon seem to be intentionally vague in their product descriptions. Many of the product listings for hemp oil on Amazon don't clarify whether the product includes CBD or not. So many unsuspecting consumers buy these products thinking they are CBD oil when in fact they are not. If you read the reviews of these products on Amazon, you'll notice many complaints from people who feel duped. 

Rather, what most of these oils appear to be are extracts of the hemp seed. As we mentioned earlier, CBD oil can be made from either hemp or marijuana cannabis plants. No matter which plant they come from, however, they must be made using the flowers, leaves, stem and stalks of the plant, as these are the parts where the CBD compound is actually located.
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