President Barack Obama, On April 15, 2013, an envelope that preliminarily tested positive for ricin, a highly toxic protein, was intercepted at the US Capitol's off-site mail facility in Washington, D.C.

[3] On April 17, 2013, FBI agents detained a Tupelo, Mississippi, Elvis impersonator, Paul "Kevin" Curtis,[3] on suspicion of mailing the ricin-laced letters.

The defense attorney claimed in court that his client was being framed, possibly by acquaintance James Everett Dutschke, with whom he had been feuding online.

[13] On April 23, agents in hazardous materials suits searched the home of a Tupelo, Mississippi man in connection with the ricin investigation.

[17] He was indicted for producing and using the deadly toxin as a weapon, and using the mail to threaten President Obama, Sen. Roger Wicker of Mississippi and Lee County Judge Sadie Holland.