CBS Evening News - "Signal Sniffer" to Aid in Nancy Guthrie Kidnapping

While authorities await DNA results and review limited doorbell footage, a new technological edge may aid the search for Nancy Guthrie. TrustedSec Founder and CEO David Kennedy joins CBS Evening News to discuss his "signal sniffer" technology. He talks about how the tool could assist in picking up her specific pacemaker signal from hundreds of feet away and locate Guthrie.