2. What is Ricin Recently a US woman and former actress has been pleaded guilty to send ricin-laced letters to President Barack Obama and New York Mayor Michael Bloomberg. Ricin is a poison found naturally in castor beans. If castor beans are chewed and swallowed, the released ricin can cause injury. It can be in the form of a powder, a mist, or a pellet, or it can be dissolved in water or weak acid.
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