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CBI officers also questioned the former principal of RG Kar Medical College and Hospital, Sandip Ghosh, for the fourth consecutive day on Monday.
After the sudden death of M C Gafoor (53), gold ornaments weighing 4.9 kg and worth around Rs 2.85 crore were missing from his house
During the narco analysis, Poonawala told investigators that he also used a cleaver to cut Walkar's body into pieces and that he threw the saw somewhere in the bushes near his office in Gurgaon, the police sources said.
The polygraph test on Aaftab was stopped midway on Thursday after he had complained of fever.
Delhi Police seized five knives from Aaftab's flat. However, they are yet to recover the saw allegedly used by Poonawala to cut his live-in partner Shraddha Walkar into pieces.
Though the assistant director and scientific officer at the lie-detection wing have to examine 170 cases in a year, only an average of 30 cases are examined in a year.
Balabahaskar's friends Prakashan Thambi, Vishnu Somasundaram, driver Arjun and Kalabhavan Soby, who claims to be a witness to the accident, underwent the test on Saturday.
The CBI officers will also record the statements of popular musician Stephen Devassy.
The three will be summoned to court on September 16 to find out if they are ready for the lie-detector test.
Mani was found dead on 6 March 2016. The CBI took over the case after his relatives alleged foul play.