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Ricin attacks

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Ricin, the toxic substance mailed to President Obama and a senator, can be deadly even in tiny quantities.
Move comes as police reportedly search another man's home in connection with the case.
New York mayor reportedly threatened by poison-laced letters.
Ricin attacks

HYATTSVILLE, MD - APRIL 16:
A hazardous materials response team truck sits outside a mail sorting facility in Hyattsville, Maryland, on Tuesday, April 16, 2013. An envelope addressed to Sen. Roger Wicker (R-MS) tested positive for ricin at the facility where mail bound for the U.S. Capitol is sorted. (Photo by Drew Angerer/Getty Images)

DREW ANGERER