The FBI says preliminary tests on a letter sent to President Barack Obama indicate the presence of poisonous ricin. It comes the day after officials said a letter sent to Sen.... | More Info

Intercepted letters show ricin, So what is it?

AP

The FBI says preliminary tests on a letter sent to President Barack Obama indicate the presence of poisonous ricin. It comes the day after officials said a letter sent to Sen. Roger Wicker tested positive for poisonous ricin.

Intercepted letters show ricin, So what is it?

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