Taiwan, as one of the jurisdictions comprising the so-called "fourth wave of democratization," fundamentally altered its criminal justice system over the course of just decades. This was particularly true with respect to the rule of law and the procedural law around the exclusion of evidence. For example, although illegally obtained, or "tainted" evidence may be crucial in the search for the truth, it is to be excluded if it was obtained under certain circumstances, including torture or coercion. The legal theory behind this area of Taiwanese law is grounded in the common law criminal justice system, although Taiwan has developed its own procedures and remedies. How illegally obtained evidence is excluded in Taiwanese criminal procedure is discussed, as is the melding of the Thai approach with its theoretical basis in Anglo-US criminal procedure. Both practical and theoretical perspectives are explored and the gaps between the formation of legislation and its enactment into judicial practice are addressed.