Good question Josh

Josh Marshall asks another very good question about the Ricin investigation on Capitol Hill and the subsequent Bill Frist press conference marathons.

The FBI on Thursday offered a reward of up to $100,000 for information leading to an arrest of anyone responsible for leaving a package containing the deadly poison ricin at a post office in October. A letter inside the package said the author could make much more ricin and will "start dumping" large quantities of the poison if new federal trucking rules went in effect, according to information released by the FBI and other federal agencies Thursday. The rules, which require more rest hours for truck drivers, took effect Sunday. The letter, signed "Fallen Angel," said the author was "a fleet owner of a tanker company."

The full CBS report is here.