1.9K views | #ExplainedIn60 | According to CBI, prime accused Sanjay Roy’s polygraph test was crucial in solving the Kolkata doctor's rape and murder case to determine if it was a gang rape or the act of a single perpetrator. Through the tests, CBI wanted to determine whether both Roy and Dr Ghosh were truthful in his statement regarding the case. What exactly are polygraph tests and how do they help an investigation. We explain  | Indian Express | Facebook
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