I could be wrong but it seems quite possible that it will be very difficult to deport unaccompanied kids. Problem #1 will be to establish their nationality.
Not that hard at all. There are people in the FBI who can listen to them speak Spanish and figure out the dialect and accent. Like for instance Cuban Spanish sounds different from Mexican Spanish. Or think of it this way, ever go to New York and listen to them speak English then go to the deep South? Kinda like that.