What Is Ricin? Poison Used In Three Recent Cases

JACKSON, Miss. — The key ingredient – castor beans – is easy to find. Crude instructions for extracting the lethal poison in them can be found on the Internet. And it doesn't require a chemistry degree or sophisticated lab equipment.

The FBI is investigating at least three cases over the past month and a half in which ricin was mailed to President Barack Obama and other public figures.

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