The real reason hemp is illegal...
Marijuana Conspiracy...
http://www.tpuc.org/content/marijuana-conspiracy
✔ All schoolbooks were made from hemp or flax paper until the 1880s. (Jack Frazier. Hemp Paper Reconsidered. 1974.)
✔ It was legal to pay taxes with hemp in America from 1631 until the early 1800s. (LA Times. Aug. 12, 1981.)
✔ Refusing to grow hemp in America during the 17th and 18th centuries was against the law! You could be jailed in Virginia for refusing to grow hemp from 1763 to 1769 (G. M. Herdon. Hemp in Colonial Virginia).
✔ George Washington, Thomas Jefferson and other founding fathers grew hemp. (Washington and Jefferson Diaries. Jefferson smuggled hemp seeds from China to France then to America.)
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Just the first 4 items from the link... Worth a read...