Wongchanapai, Wichai, Supaporn Surintaraj, Worranut Uiprasertkul, and Somboon Thamtakerngkit. 2006. “Detection of Methamphetamine in Urine Stains”. Siriraj Medical Journal 58 (3):705-10. https://he02.tci-thaijo.org/index.php/sirirajmedj/article/view/245724.