New Delhi, Feb 01 (ANI): Continuing to target Congress MP Shashi Tharoor, Bharatiya Janata Party (BJP) leader Subramanian Swamy on Saturday said the former must definitely undergo a lie detector test as he made many contradictory statements in connection with the murder case of his wife Sunanda Pushkar and interfered in the probe. Tharoor is also likely to be called in for questioning and may also have to undergo the lie-detector test.