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Necessary to determine that. again, as susan mentioned, they'll be doing field testing at each of these sites, but that's often not reliable. >> fran thompson is joining us. you're a former homeland security adviser to former president bush. there's always after 9/11 enormous security surrounding a major sporting event, especially around the super bowl, right? >> that's right, wolf. in fact, an event like this will be designated what we call a national security special event, and nsse. there'll be a designated lead agency, and, you know, we know because we've been inside it, that there's a com...

Man in east texas? >> i'm just off the phone with federal law enforcement officials who told me they questioned a man in new boston, texas, near texarkana following up on a folk placed to authorities by the man's wife in connection with three suspicious letters mailed from the louisiana mailing center to president obama, mayor bloomberg and the gun control advocacy group. this is is new from fox news that the man is not in custody or charged with a crime. one other point made to me, there are two rounds of testing that are involved anytime there's a threat with a letter believed to contain a p...

Potential senders but their investigation continues. last night we herd democratic senator claire mccaskill from missouri say, her understanding was that investigators were zeroing in on someone who is known to send in the past lawmakers a lot of letters. sources have told us that authorities have a general idea where this person might be. we don't know their identity. we know now two letters, jon, one sent to senator wicker, one sent to president obama. now we're awaiting a final tests from what the fbi says is an accredited lab to confirm the initial field testing on that powdery substance. ...

Funeral saying it was too costly. thatcher died last monday. she was 87. the senate is on high alert this morning as capitol police and fbi investigate a suspicious letter addressed to one of its members. as abc's pierre thomas reports, field tests show the letter appears to be have been tainted with potentially fatal poison. >> reporter: sources are telling us a letter addressed to mississippi senator roger wicker tested positive for poison ricin in a field test at the senate mail office in landover, maryland. the letter was postmarked, memphis, tennessee. there is no information on who may...

Have confirmed there are some similarities between two letters, the letter that was sent to the senate, also, the letter sent to the white house. jonathan dienst is standing by right here. results again may be available by late today at the earliest, we understand. >> that's right. they discovered these letters yes and the official lab tests take about 24 hours for that kind of test to be done, but preliminary field testing on both the letters to senator wicker's office and to the white house, both intercepted at off site facilities, have preliminary field tests of positive and appear to be se...