The ricin was from someone called "fallen angel" who was supposedly protesting the new DOT driver rules.
Coincidentally, this story just out. It seems they were clearing "asbestos" from the Senate Chamber just this weekend.
Asbestos cleared from U.S. Senate chamber
7/6/2004, 3:48 p.m. ET
By ALAN FRAM
The Associated Press
WASHINGTON (AP) The Senate met as scheduled Tuesday after workers removed what an aide said were low levels of asbestos, but the adjacent party cloak rooms and Senate press gallery were closed so tests and possible cleanups could be conducted.
http://www.nj.com/newsflash/washington/index.ssf?/base/politics-3/1089140123261690.xml&storylist=washington
You are right they blamed it on a truck driver in TENN. I was so mad.