THURSDAY, April 18 (HealthDay News) -- A Mississippi man has been arrested in connection with the sending of letters suspected of being tainted with the deadly toxin ricin to President Obama and a Republican senator, federal agents said Wednesday night.
The FBI has identified the suspect as Paul Kevin Curtis of Corinth, Miss., according to the New York Times.
On Wednesday, officials reported that a preliminary, inconclusive test suggests the deadly toxin ricin was in a letter sent to President Obama on Tuesday, officials report.
The letter was intercepted at the White House mail screening facility, which is not located near the White House complex, USA Today reported Wednesday.
The preliminary test showed evidence of ricin, but the FBI said only a complete second test can confirm if the letter actually did contain the deadly poison, the Associated Press reported.
Ricin, which is found in the castor oil plant, can prove deadly if inhaled, one expert noted.
"Without a doubt, ricin is toxic," said Victoria Richards, a toxicologist and assistant professor of medical sciences at the Frank H. Netter MD School of Medicine at Quinnipiac University in Connecticut.
"If castor beans are eaten [about 20 for an adult] death can occur in six to eight days," Richards said. "When concentrated, ricin powder may be lethal in a much shorter timeframe. There is a process called oral inhalation, in which powders or aerosolized agents [depending on the particle size] can be deposited in the mouth and eventually swallowed."
If swallowed, "ricin will cause nausea, vomiting, bloody diarrhea and dehydration," Richards added. "Multiple organ damage also occurs, and eventually death."
At least three U.S. senators also reported receiving suspicious mail in recent days. A letter sent to Sen. Roger Wicker, R-Miss., tested positive for ricin in a preliminary test. On Wednesday morning, a suspici
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