Hi everyone. I'm in Chiang Rai and hoping to do a border run to Mae Sai in a few days. I just met a couple of Brazilian girls who tried to do it after their initial 3 month visa-free stamp and they were turned away at the border (they had to fly to Cambodia and come back in again). Has anyone had this experience? I'm an Australian citizen with 2 month visa + 1 month extension and would like to stay for another month. Not sure if it's related to nationality, whether they were just unlucky, or if it's something larger. Thanks in advance.