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A white powder found Tuesday in a Georgetown University dorm room tested positive for ricin, but the university said Wednesday that there was no immediate threat to the community. Law enforcement officials said they believed there was no connection to terrorism. In an email to the campus community Wednesday afternoon, school officials said a substance that was removed from a room in the McCarthy Hall dormitory tested positive for ricin. The white powder can cause respiratory distress, respiratory failure, and multi-organ dysfunction, according to the Centers for Disease Control. SNIP FBI spokeswoman Jacqueline Maguire said no arrests had been made...

I have a couple of questions about Breaking Bad.

(CNN) -- A Texas actress in a troubled marriage was arrested and charged Friday in connection with ricin-tainted letters that were mailed last month to President Barack Obama and New York City Mayor Michael Bloomberg, authorities said. Shannon Richardson, 35, also known as Shannon Rogers and Shannon Guess, initially told the FBI that her husband, Nathaniel, sent the ricin-laced letters, but a polygraph exam found her to be "deceptive" on the matter, court papers said. Investigators found that her computer storage devices contained the text of threatening letters sent to the president, but the couple's computer records show her husband...

A high-tech computer system that captures images of “every mail piece that is processed” by the United State Postal Service was critical in helping federal agents track the Texas woman arrested today for allegedly sending ricin-tainted letters to President Barack Obama and New York City Mayor Michael Bloomberg. In a U.S. District Court complaint filed today against Shannon Guess Richardson, an FBI agent details how investigators traced the ricin letters back to New Boston, Texas, where the 35-year-old Richardson (seen below) lives with her husband.

FBI agents arrested Shannon Elizabeth Guess Richardson (pictured) this morning in connection with the ricin-tainted letters sent to the White House and the offices of Michael Bloomberg and Mayors Against Illegal Guns. According to NPR (yes, that NPR) her husband and original person of interest Nathan Richardson has been cleared of suspicion. The FBI now believes that Shannon sent the poison letters as part of a plot to frame her husband and divorce him, and that the letters’ rants about gun control were a red herring. That’s right: guns, racism and gun control had nothing to do with the poisoned letters....

A Texas woman has been arrested in connection with the mailing of three letters containing a form of the poison ricin to President Obama, New York City Mayor Mike Bloomberg and the director of Mayors Against Illegal Guns, federal authorities said. Shannon Rogers Guess Richardson of New Boston, Texas, originally called the Federal Bureau of Investigation claiming that her husband had sent the letters, officials said. The investigators found that she had sent the letters herself, they said. The woman was arrested in Arkansas on charges that will be filed Friday afternoon, the authorities said.

From Julie Banderas Twitter: The White House receives a letter similar to Mayor Bloomberg's. I'm on Fox Business Network at 12:22pm with the latest

Federal investigators are trying to figure out who sent two threatening letters laced with the deadly poison ricin to New York City Mayor Michael Bloomberg and his gun-control group in Washington. CBS News correspondent Elaine Quijano reports that authorities say responding officers who came into contact with the letter in New York suffered some minor symptoms. No one was seriously hurt, but now a joint terrorism task force, including the FBI and the NYPD, is investigating. Bloomberg spoke with reporters shortly after the threats against him became public Wednesday evening. "No, I'm not angry," said Bloomberg. "There are people who,...

DEVELOPING: Anonymous letters sent to New York City Mayor Michael Bloomberg and the director of the Mayors Against Illegal Guns in Washington, DC contained material that preliminarily tested positive for ricin, according to NYPD Deputy Commissioner Paul J. Browne. According to a statement released on Wednesday, the letters potentially containing the deadly poison were sent to Mayor Bloomberg on Friday and to the director of Mayors Against Illegal Guns on Sunday. It is believed that the letters threatened Mayor Bloomberg and made reference to the gun control debate...

The FBI said Monday that no one has been arrested after last week’s discovery of a pair of letters containing the deadly poison ricin in Spokane, but the agency remained tight-lipped about the investigation and a weekend raid at a downtown apartment building. … The letters were postmarked last Tuesday in Spokane and addressed to the downtown post office and the adjacent federal building. They were intercepted by the Postal Service, and no one was injured. … Witnesses have said a man was escorted from the building by law enforcement officers Saturday morning. Sandalo Dietrich declined to say if anyone...

Did the FBI get it right this time? Wall Street Journal: J. Everett Dutschke, 41 years old, of Tupelo, Miss., was charged with possessing a toxin for use as a weapon, among other charges, the U.S. attorney's office said. He is scheduled to appear in federal court in Oxford, Miss. on Monday. Mr. Dutschke was taken into custody without incident, according to an FBI spokeswoman. The arrest follows a tumultuous week in which the man initially charged with sending the letters, Paul Kevin Curtis, a 45 year-old Elvis impersonator who had quarreled with Mr. Dutschke, was released after evidence and...

A Mississippi martial arts instructor was charged on Saturday with attempting to use a biological weapon after a ricin-laced letter was sent to President Barack Obama earlier this month, the U.S. Department of Justice said. James Everett Dutschke, age 41, was arrested early on Saturday, following searches of his home and a former business as part of the ricin letter investigation. Dutschke was taken into custody by FBI agents at his Tupelo home shortly after midnight FBI spokeswoman Deborah Madden said in a statement. …

Tupelo, Mississippi (CNN) -- A Mississippi man has been arrested in connection with the investigation into ricin-tainted letters sent to President Barack Obama and other officials, federal and local officials said. FBI agents arrested James Everett Dutschke of Tupelo at his home early Saturday without incident, said FBI spokeswoman Deborah Madden. Earlier this week, agents searched Dutschke's residence and former martial arts studio, though it's not clear what they found. On Tuesday, prosecutors dropped charges against another man, Paul Kevin Curtis of Corinth, Mississippi, who was arrested April 17 and accused of sending a threat to the president after letters...

Paul Kevin Curtis, suspected of sending ricin-tainted letters to President Obama and other public officials, was released on bond today, a day after a court hearing in which investigators said they found no evidence of the poison in Curtis' home or car. The U.S. Marshals office in Oxford, Miss., confirmed that Curtis had been released from jail, where he had been kept since last week on formal charges of sending threats through the mail. … Curtis was formally charged last week with sending mail that contained a threat to kill or harm the president and with sending mail containing a...

Chad Pergram ‏@ChadPergram 1m Reid on Ricin: We've had another incident today at Bolling AFB..We'll see.. I can't give any more details on ricin at Bolling..

OXFORD, Miss. The Mississippi man charged with sending poisoned letters to President Barack Obama, a U.S. senator and a state judge was released from jail on Tuesday, federal official said, though the reason for the release wasn't immediately clear.

OXFORD, Miss. (AP) — Officials have cancelled the third day of a hearing for the Mississippi man accused of mailing poisoned letters to President Barack Obama, a U.S. senator and a local judge. Christi McCoy, defense attorney for Paul Kevin Curtis, says that federal authorities and defense attorneys will speak to reporters at 5 p.m. CDT about the case.

Investigators haven't found any ricin in the house of Mississippi man accused of mailing poisoned letters to President Barack Obama, a U.S. senator and a local judge, according to testimony Monday from an FBI agent.

That Was the Week That Was(with apologies to Billy Joel)Continued

On Wednesday, authorities arrested Paul Kevin Curtis of Mississippi on suspicion that he is the author of the ricin-laced letters sent to politicians in Washington including President Obama. The letters never got within miles of their intended targets; mail screening for the House, Senate and White House was tightened after the anthrax attacks and remains tight. The ricin letters included a distinct phrase: “To see a wrong and not expose it, is to become a silent partner to its occurrence.” The letters were signed “I am KC and I approve of this message.” Liberty Speaks blog decided to see what...