What is Polygraph test, that Aftab Amin Poonawala had to undergo in Shraddha Walkar murder case?

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What is polygraph test, that Aftab Amin Poonawala had to undergo in Shraddha Walkar murder case?

Polygraph test: Here is all you need to know about the test that Aftab Amin Poonawala had to undergo in Shraddha Walkar murder case.