Great article! Excellent point by Matt, precisely why I found this article. I would just add that the CBD percentage in the extract can be significantly lower than even the 20%, but its probably fair to use that to give a rough idea how much CBD might be in an Amazon product, so divide the claimed percentage by 5!. Claims of up to 60% on Amazon are totally ludicrous, any concentration above 20% CBD become darker very viscous and the CBD starts to crystalize in the bottle! You would need to heat the bottle (which can damage the properties of the carrier oil) to re-liquidize! Also beware of Amazon reviews which are notorious for being fake. As author suggests, contact seller for full data sheets or seek a reputable supplier elsewhere that gives full transparency of information up front.

There are 33 states with laws specifically regulating Hemp to include: Alabama, California, Colorado, Connecticut, Delaware, Florida, Hawaii, Illinois, Indiana, Kentucky, Maine, Maryland, Michigan, Minnesota, Missouri, Montana, Nebraska, Nevada, New Hampshire, New York, North Carolina, North Dakota, Oregon, Pennsylvania, Rhode Island, South Carolina, Tennessee, Utah, Vermont, Virginia, Washington, and West Virginia.
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. 
Thank you for the information.  A friend of mine recently gave me a small bottle of Cloud 9 hemp, lizard king.  Said she was told it is good for COPD.  Can not find anything that backs up that statement, You article also said that Cloud 9 is a brand that uses Propylene and the effects on the lungs when vaporizing has not been determined but OK to use externally.  Is all this correct?
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Hemp producers who sell CBD products will often use the 2014 Farm Bill to claim that it is legal. This bill includes a provision that allows for the legal cultivation of hemp provided it is used for academic agricultural research or under a state pilot program. But there is still confusion about whether the legal allowance for cultivation also includes selling it.
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