Thais entering Thailand on foreign passports
A Thai citizen entering Thailand on a foreign passport may stay for up to one year. He must first obtain a visa in order to enter Thailand. This can be a standard 30-day tourist visa. Once in Thailand, he should bring his Thai ID card and his house registration papers (tabien baan) to the Immigration Office and apply for a one-year stay.
Pol Capt Krisarat Nusen, Phuket Provincial Immigration Office.