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According to sources, police came across the audio recording of a purported heated argument between Walkar and Poonawala while investigating the murder case.
The accused, currently lodged in Tihar Jail, was taken to the CFSL to record his voice sample and check if it matches with the male voice in the clip, they said.
The sources also said the investigating team has got a purported video of the duo in which Poonawala is allegedly seen being counselled. This purported video was shot in Mumbai. So the investigating team is also in the process of getting Poonawala’s face recognition test done. During the process, Poonawala’s 3D image will be taken. This is being done to ensure that he cannot deny his presence in the purported video, they added.
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The accused was arrested on November 12, and a court in New Delhi on Friday extended his judicial custody by 14 days.