In this May 31, 2013 file photo, members of an FBI hazardous materials team prepare to enter a residence in New Boston, Texas in connection with a federal investigation surrounding ricin-laced letters... more 
In this May 31, 2013 file photo, members of an FBI hazardous materials team prepare to enter a residence in New Boston, Texas in connection with a federal investigation surrounding ricin-laced letters mailed to President Barack Obama and New York Mayor Michael Bloomberg. (AP Photo/Texarkana Gazette, Evan Lewis, File) INSET: In this image taken from video and provided by WNBC-TV in New York, the envelope that contained the ricin tainted letter mailed to New York City Mayor Michael Bloomberg is shown. (AP Photo/WNBC-TV) less 
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Associated Press | Photo By Texarkana Gazette/Evan Lewis/WNBC-TV / AP Photo
Tue, Dec 17, 2013 6:00 PM EST