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Martin richard. there is a candlelight vigil being held in his neighborhood of dorchester and tons of people out for that. from washington, we have nbc news justice correspondent, pete williams. thank you so much for being with us. it to get to the investigation and what we know, the latest on that, but first, i want to begin with these ricin reports. a letter sent to roger wicker did test positive. how serious should we take this? what are the odds of a false positive? i'd like to get a little context before we start ringing the alarm bell. >> let's understand what the results come from. all ...

News justice correspondent, pete williams. thank you so much for being with us. it to get to the investigation and what we know, the latest on that, but first, i want to begin with these ricin reports. a letter sent to roger wicker did test positive. how serious should we take this? what are the odds of a false positive? i'd like to get a little context before we start ringing the alarm bell. >> let's understand what the results come from. all mail to the u.s. capitol is sent to an off sight facility where it's tested for all kinds of things. the envelope was found, pulled out of the mail supp...