was an injection mark reaching the spinal canal. Its dura was punctured. Based on this, PW9 opined that it might have occurred when spinal anesthesia was administered. On the other hand, in the case sheet of the Deen Hospital (Ext. P12 series), it was recorded that what was administered was general anesthesia. It has come out in evidence that to ascertain whether spinal anesthesia was administered, the best and sure test is to collect and analyse Cerebro Spinal Fluid (CSF). DW3, an expert in forensic science, and PW 14, a consultant anesthesiologist at Poyanil Hospital, gave evidence that the CSF test is the confirmatory test to find out the administration of spinal anesthesia. CSF is a clear fluid that surrounds and protects the brain and spinal cord. CSF analysis is a group of tests that measures chemicals in the cerebrospinal fluid. PW9 admitted that CSF was not collected for chemical examination. According to her, it was blood-stained, so it was not attempted. On the other hand, DW3 categorically deposed that CSF will be available in several areas, and even if it is blood-stained, it can be sent for chemical