Article 20(3) of the Constitution provides protection against self-incrimination, stating that no person accused of any offence shall be compelled to be a witness against himself. The Supreme Court in the landmark case Selvi & Ors vs State of Karnataka & Anr (2010) held that involuntary administration of techniques like narco-analysis, polygraph (lie detector), and brain electrical activation profile tests constitutes compelled testimonial acts that violate the protection under Article 20(3). These tests aim to extract incriminating information from the subject's mind without their conscious consent.