https://www.nyulawglobal.org/globalex/Thailand1.html
4.5. Judicial Decisions
Thailand is not a common law jurisdiction and judicial precedent is not binding on lower courts. The Supreme Court of Justice is not bound to follow its own decisions, and lower courts are not bound to follow precedents set by higher courts. In practice, however, the decisions of the Supreme Court of Justice do have a significant influence on the Supreme Court of Justice itself and lower courts. Supreme Court decisions are printed on a regular basis and distributed to law libraries and private subscribers