Forensic experts have nearly completed a crucial stage in verifying an audio file and several videos, whether they are edited or unedited, recovered by ACB sleuths as part of the cash-for-vote case. A report of authenticity will be sent to ACB shortly , who in turn might summon suspects and accused.
Presently , Andhra Pradesh State Forensic Science Laboratory (APSFSL) officials are verifying an audio tape of a conversation allegedly between Andhra Pradesh chief minister Chandrababu Naidu and nominated MLA Elvis Stephenson besides the videos of Telangana TDP MLA Revanth Reddy bribing the Anglo-Indian legislator.
APSFSL sources said that authentication (stage-I) of both the audio and video samples are being done with special software tools without any human intervention to avoid any dispute.
Armed with the stage-I report, ACB investigators might issue notices after getting scientific confirmation (whether the audio tape is edited or unedited).In the notice, the accused suspectswitnesses would be called to give their voice samples, which would be stage-II besides facing inquiry . “The audio and video samples involving Naidu and Revanth are being verified minutely since even a microsecond of the tape should be checked thoroughly to verify whether it is foolproof. The report will be given to ACB in the next few days,” an APSFSL official told TOI.Naidu had already made it clear that he would refuse to take any notice from the Tel angana ACB.
With plenty of Naidu’s speeches available in public domain, APSFSL and ACB officials reportedly decided to use the existing samples while comparing the purported audio file, which has the conversation between the him and Stephenson.
While conducting any audio authentication test, multiple voice samples would be compared with the seized audio tape. Naidu’s recent speeches at different fora besides archives of the Legislative Assembly might be tapped for his voice samples, the sources said.
“We usually look for various aspects like slang, pitch and base frequency while uttering certain words before coming to any conclusion about the authenticity of the audio file. However, with the technology available at APSFSL, the finding can be indisputable,” a forensic expert said.