Patan Khaja Babu @ Babu & Ors vs State Of A.P

In Selvi v. State of Karnataka, the Supreme Court held that the use of narco-analysis, polygraph tests, and brain mapping as investigative tools violates the right to privacy and the right against self-incrimination under Article 20(3) of the Constitution. The Court emphasized that such techniques cannot be used without the consent of the individual, establishing a precedent that safeguards personal liberties against coercive interrogation methods. Consequently, the appeal was allowed, and the orders of the lower courts were set aside.