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They knew what i bought. >> reporter: and detectives wanted to know more about who peggy might have had contact with in the hours before her murder. so they made this list of numbers they found on peggys home phone. and as they looked at them, one stood out. it was a call from an odd area code, and it came in at 1:17 in the morning. >> that was from what turned out to be a tracfone. theyre commonly referred to as burner phones or throwaway phones. >> reporter: these are the phones used by drug d...