New Delhi, June 10 -- A narco-analysis test cannot be conducted on an accused person without their consent, and the results of such tests cannot form the sole basis for conviction in a criminal case, the Supreme Court ruled on Monday. Emphasising that the pursuit of modern investigative tools cannot override fundamental constitutional protections, the top court underscored that involuntary narco tests infringe upon the right against self-incrimination and the right to personal liberty guaranteed under Articles 20(3) and 21 of the Constitution. A bench of Justices Sanjay Karol and PB Varale set aside a 2023 Patna high court order that had accepted an investigating officer's proposal to conduct narco-analysis tests on all accused and witnesse...