From the Bangkok Post:
Security border officials are quite certain that former prime minister Yingluck Shinawatra left Thailand by sea during her escape from Thailand.
A source at the Royal Thai Navy said it was unlikely that Ms Yingluck crossed an unmanned land border, such as those in Chanthaburi and Trat, as they feature mountainous terrain which are thought to be infested with landmines.
“I believe a VIP like Khun Yingluck would not choose such a channel to slip out of the country,” the source said. “She would surely have chosen a comfortable way.”
Ms Yingluck failed to turn up at the Supreme Court’s Criminal Division for Political Office Holders on Friday to hear the ruling on her alleged negligence in the rice-pledging scheme.
The source added that it would be even harder for Ms Yingluck to leave the country via an official border post, as these are permanently monitored by soldiers, immigration police and customs officials. […]
Whatever method and route she used, it is generally assumed that Ms Yingluck crossed in to Cambodia before catching a flight via Singapore to Dubai, where her brother and fellow former PM Thaksin Shinawatra lives in exile.