 Those who have not seen Hansen's "Dateline" investigations before often assume he is either the child's father or a member of a law enforcement agency.After a few minutes of questioning, Hansen identifies himself as a "Dateline NBC" correspondent and informs the visitor that the entire interview has been recorded on hidden camera as part of the "Dateline NBC" story.Then "Dateline" crew members with large cameras and microphones reveal themselves, and the person is offered a chance to make a final statement before being asked to leave.