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(Tupelo, MS)  Now that federal charges against Paul Kevin Curtis has been dropped regarding three ricin laced letters, investigators have turned their attention to another man.

Tuesday, agents were at the home of J. Everett Dutschke in Tupelo.

Today those same investigators are at a karate studio owned by Dutschke in Tupelo.

Last week an attorney for Curtis suggested investigators speak with J. Everett Dutschke.