"I did not want to take this case for the parents because, quite frankly, when I got on that plane I thought they did it," Stanton said.
He said that the first time he sat down with the parents, he told them, "I'm not here for you. I'm here for Lisa."
Stanton did not go into specifics, but he said that the more he investigates the disappearance, the more he believes the abductor was from outside the home.
Bradley said she has had to talk to Lisa's two brothers about her disappearance.
"My boys ask about her all the time," she said. "We tell them we're never going to stop looking. We'll bring her home."