The CBI has taken the voice samples of its sacked public prosecutor A K Singh and Managing Director of Unitech Sanjay Chandra for matching them with the audio tape purportedly carrying conversation between the two discussing ways to allegedly weaken the 2G case.
The probe agency has also constituted a special team of officials who will make an assessment of damage, if any, to the prosecution in the spectrum allocation case.
Sources said today investigations so far indicated that the CD was an apparent outcome of growing corporate rivalry in the Telecom sector and did not rule out some more tapes surfacing soon.
The tapes purportedly containing voice of Singh and Chandra had been sent for forensic examination, CBI officials said, adding the voice samples of the two had also been taken but would be handed over only after the examination of the tapes was completed.
According to sources, the tape had been recorded by someone who was present in a room along with Singh and Chandra when they are alleged to have been discussing the strategy in the case.
The sources said the agency would move in for cancellation of Chandra's bail only after getting a clearance from forensic department of the CFSL.
The CD containing the purported conversation has been sent to the Physics department of CFSL which has a very advanced version of computerised Voice Spectrograph used for analysis of Speaker Identification.
According to the CBI, the team of senior officials will go through the legal representations of the case in a retrospective manner in order to see if any wrongdoing on the part of any CBI official weakened the case of the agency.
The agency has also registered a Preliminary Enquiry after it received an "audio tape" from "undisclosed sources" on February 6, they said.