Nightly News | April 18, 2013
>>> nbc news has confirmed it was indeed ricin that was in those letters mailed to some officials in washington. it's been confirmed due to a second round of tests. today, 45-year-old paul kevin curtis was in a mississippi courtroom charged with making threats against president obama , mississippi senator roger wicker , and a local county judge . curtis happens to be an elvis impersonator . senator wicker hired him a decade ago to work at an event. a lawyer for wicker said he was innocent. officials say none of this was related to the boston bombing this is week.