An Elvis impersonator and singer in Mississippi is suing the federal government for wrongful arrest after he was charged and later cleared of sending poisoned letters to President Obama.

Paul Kevin Curtis filed a lawsuit April 30 in federal court, claiming that prosecutors continued to hold him in jail even after they knew there was no evidence that he had mailed letters dusted with a crude form of ricin to Obama, Republican U.S. Sen. Roger Wicker, and a Lee County judge.

Federal agents eventually arrested another man, James Everett Dutschke of Tupelo, Mississippi. He pleaded guilty, was sentenced to 25 years in prison, and is doing time at the Supermax federal prison in Florence, Colorado. Dutschke has filed multiple motions to set aside his conviction.