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>> any idea what he is saying. >> no. >> here's the translation, regular sandbags are heavy, peyton's are lighter making them easier to carry because they are filled with chemicals and salt and only expand when doused with water and less water gets through the cracks. >> when you add it to water it expands. >> whoa. >> reporter: like any scientist, peyton knows that field tests are a must. i'm safe behind your barrier here. >> reporter: engineers say peyton's invention is a real deal. >> he would be a fantastic student here at um. >> reporter: until then, peyton will keep tinkering. matt gutma...

Analyst and former homeland security adviser fran townsend. also on the phone, dr. sanjay gupta. they mentioned the gun debate, the joint terrorism task force is investigating. it could be more of a political threat than a terror threat, really. >> that's right, anderson, but as you've mentioned, that's not really at the moment the most relevant piece to the investigators. they don't much care about motive at the moment. they want to know who. and so, to determine the who, they will look for the forensics. they'll look for things like saliva, hair, fingerprints on the letter or on the envelope...

Homeland security adviser fran townsend sits on the cia and external advisory panels, and dr. sanjay gupta. fran, we have reports the letters mentioned the gun control debate over the joint terrorism task force investigating. it could be more of a political threat than a terror threat. >> that's right, anderson. as you mentioned, that's not really at the moment the most relevant piece to the investigators. they don't much care about motive at the moment. they want to know who. and so to determine the who, they will look for the forensics, things like saliva, hair, fingerprints on the letter or...

>> mayor, is this because of your outspokenness about guns and your thoughts about that? >> well, there was a letter that threatened us. the letter was obviously referred to our anti-gun efforts, but there's 12,000 people that are killed this year with guns, 19,000 are going to commit suicide with guns, we're not going to walk away from those efforts. i know i speak for close to a thousand mayors, this is something we need to get under control and eliminate. >> do you feel threatened? >> no, i don't feel threatened. >> jonathan dean joins me now. you cover stories in new york that involve any ...

Commit suicide with guns, we're not going to walk away from those efforts. i know i speak for close to a thousand mayors, this is something we need to get under control and eliminate. >> do you feel threatened? >> no, i don't feel threatened. >> jonathan dean joins me now. you cover stories in new york that involve any traces of terrorism in any way. what's the latest we know about this? >> what makes this case concerning is that the lab tests came back, not only field tests but lab tests for the new york letter came back positive for ricin. unclear of the potency, they say two workers had min...