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78 PW-20, Sh. D. Venkateswarlu, deposed that he was working as Assistant Director (Computer Forensics & Incharge Engineering Section) in A.P. Forensic Science Laboratory, Andhra Pradesh, since March 2012. Prior to that he worked as Scientific Officer since 2003 till March 2012. He joined in A.P.F.S.L. in 1993 as Scientific Assistant. He under went induction training programme for a period of five months in physical examinations and was posted in physics section. In this section, he had examined many physical evidences including audio video examinations. He had attended training programme at All India Institute of Speech and Hearing, Mysore and CFSL, New Delhi regarding voice examination and he had also attended training programme conducted by CFSL, Kolkata in collaboration with Indian Statistical Institute, Kolkata regarding image analysis and video examinations. In this case, their office i.e. physical evidence section received 8 sealed covers and one sealed cloth parcel on 22.6.2005 through CBI along with a forwarding memo vide letter Ex. PW18/B (D-12, 4 pages including annexure). On two such sealed covers, related to Tehlka-28 and Tehlka-34, seals were bearing impression as CBI,N.DELHI along with Ashoka emblem. The seals were intact and were tallied with the sample seals. First such parcel was HI8 tape of Sony Video purportedly containing audio visual recording of conversation between Mathew Samuel and Narender Singh which took place on 4.11.00 and which was marked by us as item No. 1.

CC No. 56/2011 CBI Vs Narender Singh 46 of 71 1022), Sonic communications set (Int.) Ltd., bearing number 343666, yuasa 12 V battery (2.1 Ah) bearing number 0011842, Montu Charger (12 V) & Sony infolithium battery (7.2 V & 21.6 Ah) model no. NP-F 750- marked by him as item 10. Detailed video examination, audio examination, auditory examination, voice spectrographic examination had been carried out. However, he remained associated with audio examination and also took assistance of Sh. U. Ramamohan (Computer Forensic Expert) in conducting video examination.