How chewing gum helped crack a 42-year-old murder case

A detective devised an unusual plan to catch a killer: using chewing gum to secretly collect his DNA. Peter Van Sant reports on the undercover operation that helped solve the cold case murder on the season premiere of "48 Hours."

A detective devised an unusual plan to catch a killer: using chewing gum to secretly collect his DNA. Peter Van Sant reports on the undercover operation that helped solve the cold case murder on the season premiere of "48 Hours."