Most people do not get asked anything. Some people who obtained DTVs in nearby countries have been asked some questions as far as I have seen in this group. In Chiang Mai they seem to ask much more for some reason. From all the reports I have not seen a single person get denied entry though. I would just bring all the documents you used to apply with, thats what I am gonna do. My first re entry is later this week, after 5 months in Thailand
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