A key document necessary for post-mortem came under the spotlight today as the Supreme Court heard the Kolkata doctor's rape and murder case. Chief Justice of India DY Chandrachud questioned where the challan was and pointed out that an autopsy cannot be carried out without it. Senior Advocate Kapil Sibal, appearing for the West Bengal government, submitted that he could not find the document immediately and would get back to the court on this question. The question came up after an advocate appearing in the matter asked if the clothes of the victim were produced during the autopsy.