“I have been treated well and I need the help of the United States government,” he said on the tape. “I immediately knew it was Bob, and so I watched carefully, trying to figure out what the message was,” says Christine. “I still don’t know.” Levinson is a father of seven and now has two grandchildren. In March of 2007, working as a private investigator, Levinson traveled to Dubai on a case involving counterfeit cigarettes. He took a side trip to Kish Island, an Iranian free trade zone that requires no entry visa. He met with a contact there and was arrested by Iranian authorities. “When this first happened, I expected him to be home in a couple of days,” says his wife. “Unfortunately, that hasn’t happened, and we still have no information on where he is or how to get him home.” “I believe he’s alive and in Iran, or one of the countries nearby,” says Christine. In 2007, Christine and son Daniel traveled to Tehran to meet Iranian officials, but the Iranians claimed to have no information about the missing American. “They said that they were working and doing everything they can. I think there (are) still opportunities for the Iranian government to help us,” Daniel tells CBS News. But pressed by Charlie Rose in an interview for “CBS This Morning,” Ahmadinejad did not deny Iran still has Levinson in its custody, and he hinted that there had been talks about a prisoner exchange. “I remember that last year Iranian and American intelligence groups had a meeting, but I haven’t followed up on it,” said the Iranian president. “I thought they’d come to some kind of an agreement.” Miller says that, “tacit admission that he’s in their custody and that there have been talks,” in and of itself, “is a big step.” “I think that’s going to give a ray of hope to the family, too,” adds Miller. For more on this case and for CBS News senior correspondent John Miller, a former FBI assistant director’s analysis, watch the video above.