Folk A News Today

First to explain to folk a -- folks a little more in depth. a missing baby, and there actually was a picture after birth, put out the apb, they probably didnt have amber alerts then, and 18 months later the parents get the good news that their babys been found, and now that baby is 49 years old. he asks for a dna test with his parents cooperation. its not their son. how do the investigators who open a case this cold start? how do they start this investigation? >> its very difficult, almost 50 ye...