On Thursday, March 5, 2015 at 4:01:49 PM UTC-5, Oren wrote:
On Thu, 5 Mar 2015 12:44:22 -0800 (PST), trader_4
wrote:

Why is hemp illegal?

"...The United States was the first country to introduce laws to
destroy hemp plants, regardless of their intended use. That law was
the result of political pressure exerted by the forestry industry and
the Dupont corporation, which had just patented oil and coal based
plastics production."

https://www.greenleft.org.au/node/20329

And your source is a claim made by "greenleft"? Good grief,
I'm beginning to worry about you Oren. What's next, a cite from
moveon.org?

Relax Trader. Other sources also point to hemp being banned.
Government in bed with corporations. Hemp can be used in ~ 25,000
products. Who wins and who losses?

The point is there isn't much, if any, evidence, beyond just the
accusation that Dupont was behind banning the growing of hemp.
Hemp sales were apparently declining for years before the 1937 ban.
And nylon has huge differences in properties compared to hemp.
If you have credible sources with something more than just making
the accusation, I'd be happy to see them.