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This article investigates the application of the nemo tenetur se detegere principle in decisions of Habeas Corpus in the Tribunal de Justiça de Mato Grosso do Sul (TJMS), focusing on informal confessions in drug trafficking cases between 2020 and 2024. Based on the following research question: “How does the Tribunal de Justiça de Mato Grosso do Sul justify its decisions in Habeas Corpus rulings that point to the nullity of informal confessions obtained by police officers during the investigation of drug trafficking crimes from 2020 to 2024?” Through documentary analysis of acórdãos and a literature review, this qualitative research identifies significant resistance among judges to adequately address informal confessions. It was found that most cases resulted in denied orders without recognizing the nullity of confessions obtained without informing the right to remain silent. The research concludes by highlighting the discrepancy between international human rights principles and legal practice, underscoring the need for a more critical approach aligned with fundamental rights in the Brazilian judiciary.