(probably) dumb questions about castor oil & ricin

One can buy castor oil in any pharmacy, Kmart, even the 99 cent store. Castor oil is made from the castor bean (a seed, actually). The castor bean also contains ricin, an extremely toxic substance.

*How hard is it to manufacture castor oil separating the ricin?

*Has there ever been a case of ricin ending up in the final product of castor oil?

*Why isn’t working in a factory that makes castor oil considered an extremely dangerous job?

*What happens to the castor beans & ricin after the castor oil is made?

*Why isn’t there tons of ricin on the black market from being snuck out of the companies that make castor oil?

*Where are the castor plants grown for castor oil that is made in the U.S.?

Maybe not extremely dangerous, but somewhat dangerous. From Wikipedia:

In order to poison an individual, ricin must be inhaled, ingested, or injected, all of which are unlikely (but not impossible) in a factory setting.

From the Wikipedia page on ricin,, it looks like ricin is inherently a part of the waste leftover after production of castor oil, rather than being included with the oil.

Castor bean production map:

India, China and Brazil are the top three producers, with Ethiopia a distant fourth place.