AP is reporting

“WASHINGTON (AP) – A white powder, which preliminary tests indicated could be the deadly substance ricin, was discovered Monday in the office of Senate Majority Leader Bill Frist, R-Tenn., in the Dirksen Senate Office Building.”

Prelim updates from other wires are suggesting it is in fact Ricin.

Isn’t it interesting that now that the left is screaming about such weapons, that they show up?

Developing, as Matt says….