Yes. It's one of the more deadly poisons known to man.
Why was this guy REALLY manufacturing ricin? Don't be telling me it was for laxatives or for lock jaw, because we have labs which refine natural remedies for those things...
There's more here. Gotta be.
cake_crumb, you indicate that it is, but I question that. Were it illegal, college biochemistry labs would need to be rounded up en masse!