Envelope tests positive for ricin at Washington mail facility

Envelope tests positive for ricin at Washington mail facility

A source tells CBS News that it came up with a positive hit for ricin, while two other tests were negative for radiological or biohazard material; a source said it's common for false positives to come back on field tests of ricin. There's no additional

It was not immediately clear when the envelope was received. But it arrived in a Senate mail facility, which has now been closed for more testing. All congressional mail will now be processed through the U.S. House facility.

Roger Wicker of Mississippi twice tested positive Tuesday for ricin, a potentially fatal poison, congressional officials said, heightening concerns about terrorism a day after a bombing killed three and left more than 170 injured at the Boston Marathon.

LIVERMORE, Calif.â€" Researchers at Sandia National Laboratories are developing a medical instrument that will be able to quickly detect a suite of biothreat agents, including anthrax, ricin, botulinum, shiga and SEB toxin. The device, once developed,

House Homeland Security Committee chairman Michael McCaul, R-Texas, said that there is no evidence indicating that the attack on the Boston Marathon yesterday is related to the ricin letter intercepted today en route to the office of Sen. Roger Wicker