Well, the topic was not about your husband, but about naturalized citizens. It's obvious that Migracion will never ask Dominicans who live in US for their Dominican passports, no matter that the law says. They bring money to the country, they show their US passports, everything is OK. But that doesn't mean that once in a blue moon they don't decide to enforce that law for some naturalized citizen, telling him that he has to have his Dominican passport on him and they have to put the exit stamp there, not in his foreign passport. They have the right to do that, and I doubt that somebody wants to miss his flight while arguing with them, especially if by the law they are right. I had a situation once when I showed both passports (a Dominican and a foreign one) to the Migracion officer, and she was about to put an exit stamp in my foreign passport, but her supervisor was standing nearby, she came there and said to her that No, she must put it in my Dominican passport, no matter if I have another one.