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" After officials intercepted a letter laced with ricin poison en route to the US Capitol building yesterday, authorities found another letter containing a &amp;quot;suspicious substance&amp;quot;  addressed to President Obama  at the White House&amp;#039;s off-site mail facility. Today, the  message tested positive for ricin.   House Homeland Security Committee chairman Michael McCaul of Texas said that there&amp;#039;s no current evidence  linking the first ricin letter  to Monday&amp;#039;s  Boston Marathon attack.  That envelope was addressed to Republican Sen. Roger Wicker of Mississippi, but it never reached his office after it was quarantined and  a preliminary test came back positive  for the deadly substance. The FBI is performing additional tests at the Army&amp;#039;s biomedical research laboratory in Fort Detrick, MD, to confirm the initial results.   According to the  Centers for Disease Control and Prevention , ricin is a toxic, biological agent found in the waste from processing castor beans into castor oil, and exposure can occur through inhalation, ingestion or through the skin or eyes. News of a white, powdery, poisonous substance found in letters has renewed discussion about the anthrax scare that occurred a few weeks after the September 11 attacks in 2001, as well as the  previous ricin scare  at the Capitol in 2004.   The first letter had a Memphis, TN, postmark and no return address on the envelope. There&amp;#039;s no information about the origin of the letter sent to the president, and authorities are searching for suspects.  Do you think more poison-laced letters will surface in the coming days? Comment below. "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.womansday.com/life/news/a47427/two-poison-laced-letters-found-in-washington-dc/>