What is Ricin? Learn About the Poisonous Substance

Updated: 04/17/2013 12:01 PM KSTP.com By: Maricella Miranda

Letters sent to a U.S. senator and the president have initially tested positive for ricin. The poisonous substance has the following characteristics, according to the Centers for Disease Control and Prevention. Click here for more information about the substance.

What is it?

What is it used for?

How can you be exposed to it?

How it's poisonous?

Additional resources by the CDC