There is no known antidote for the toxin, which is derived from castor beans.
Democratic Rep. Kathy Castor said Floridians could have used the appropriation to create jobs.
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According to the Centers for Disease Control and Prevention, ricin is a poison found naturally in castor beans.
The federal government has offered no evidence he had ricin or castor beans in his possession, she said.
Roger Wicker, a Mississippi Republican, received a letter containing ricin, a toxin derived from the castor oil plant.
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The FBI said the substance tested positive for ricin, a toxin derived from castor beans that has no known antidote.
The FBI said the letters tested positive for ricin, a toxin derived from castor beans that has no known antidote.
"Gov. Scott's decision demonstrates a devastating lack of vision for Florida and a lack of understanding of our economic situation, " Castor said.
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But according to the affidavit, Dutschke insisted that he'd never researched anything about ricin and that he'd never even seen a castor bean.
Dutschke, the affidavit stated, also said he'd never researched anything about ricin, a toxin derived from castor beans that has no known antidote.
Plants in this family, which include the rubber tree, castor oil plant and the cassava shrub, are typified by small blossoms, the researchers comment.
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In 2008, authorities said a man in Las Vegas may have accidentally poisoned himself with ricin that he had made from a backyard castor plant.
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"Investors are pricing in a scenario under which there will be an outbreak which will severely hurt the airlines' earnings, " said Castor Pang, head of research at Core Pacific-Yamaichi.
The plants grow wild along highways and in other spots in the U.S. They are also considered ornamental by some gardeners and are cultivated for medicinal castor oil and other products.
Security and counterterrorism expert Michael Fagel, who teaches at Northwestern University and is a veteran of ricin investigations, said ricin may be employed because castor beans are so easy to come by.
The affidavit also said numerous documents found in Dutschke's home had printer markings that were similar to ones on the letters and that he had used the Internet to buy castor beans, from which ricin is derived.
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The FBI said Dutschke, a former martial arts instructor and unsuccessful candidate for various political offices, bought his castor beans on eBay and may have used a coffee grinder to turn them into a powder from recipes he downloaded on his computer.
Law enforcement agents should be able to test the toxin found in the letters to determine its potency and purity, as well as learn what chemicals may have been used to extract it from widely available castor beans, said Murray Cohen, the founder of the Atlanta-based Frontline Foundation, which trains workers on preparedness and response to bioterrorism and epidemics.
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