Abstract This article discusses the exclusion of evidence in the Qatari and US legal systems. It focuses on the legal basis on which the exclusion of evidence is established in these two systems. The Qatari legal system is a dual system between Islamic Sharia and Qatari legislation. It relies heavily on the rule of invalidity, which is a procedural penalty that is applied when the conditions stipulated by the law are violated in relation to the procedure that was conducted. Meanwhile, the US legal system relies on the exclusionary rule, as this rule has a judicial source. This research discusses the exceptions to the exclusion of criminal evidence in the Qatari and US legal systems to explore how effective are these exceptions in achieving a balance between the goal of protecting the rights and freedoms of individuals and the goal of punishing criminals to preserve the stability of society.