Detailed text transcripts for TV channel - MSNBC - 20150318:18:04:00
Back with presumptive positive. they traced the return to address to an address that has sent previous letters to the white house. so let's talk about the background of what they've sent to the white house. >> reporter: he is someone known to the secret service. according to brian leery, the spokesperson with the secret service, officials at the white house mail screening facility located here in washington, d.c. received an envelope on monday that was suspicious. it was negative tor toxic chemicals but on tuesday, according to larry, the chemical testing returned a presumptive positive for cy...
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