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Ricin roils Washington: How dangerous? (+video)

Preliminary tests indicate that letters sent to President Obama and to Sen. Roger Wicker (R) of Mississippi were laced with the potentially deadly poison ricin. They were postmarked Memphis, Tenn.

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Meanwhile, at least three questionable packages turned up in Senate office buildings, according to the AP. Capitol Police retrieved them while establishing a series of rolling lockdowns throughout some areas of the Senate side of the Capitol Hill complex. Confused Senate aides took to social media to share which corridors were open and which closed.

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Washington Editor

Peter Grier is The Christian Science Monitor's Washington editor. In this capacity, he helps direct coverage for the paper on most news events in the nation's capital.

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Ricin is a potent toxin found in the seeds of the castor plant. Touching it can produce a rash that is irritating but not fatal. Inhalation or ingestion of ricin particles is more dangerous, leading to death in three to five days if the dose is sufficiently large.

Ricin is not difficult to extract – the production of castor bean oil results in a mash that is approximately 5 percent ricin, for instance. Recipes for making the poison are readily available on the Internet and from commercial bookstores.

As a weapon of mass destruction ricin is unsuitable, according to a 2010 report on its production and dangers produced by the Congressional Research Service. It would be too hard to handle and too difficult to spread.

But scientists have long warned that it might be used in terrorism.

“Although causing mass casualties would be difficult, many experts agree that ricin could be a formidable weapon if used in small-scale attacks…. Although a string of attacks targeting dozens of victims at a time may not produce mass devastation, they might instill terror in the population, causing local economic disruption,” wrote CRS specialists Dana Shea and Frank Gottron in 2010.

The most notable past use of ricin occurred in 1978, when Bulgarian dissident Georgi Markov was assassinated by someone wielding an umbrella tipped with ricin pellets in London. Shortly thereafter, another Bulgarian exile, Vladimir Kostov, was found to be suffering from non-fatal ricin poisoning.

In the United States, in 2008 a man trying to produce ricin in a Las Vegas hotel room poisoned himself, according to CRS. He recovered and was convicted of charges of possessing an illegal biological toxin.

In 2003 the Secret Service intercepted a ricin-laced envelope addressed to the White House. In 2004 traces of ricin were detected in the mailroom of Sen. Bill Frist (R) of Tennessee.

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