The agency has used the services of forensic experts from premier All India Institute of Medical Sciences to detect if Batcha was killed but even after detailed examination, sleuths have not found anything which can substantiate the murder hypothesis, agency sources said.
The CBI has, for cross-checking, roped in a team of doctors from AIIMS to examine the viscera and post mortem details of Batcha to rule out any "foul play" in his death. They said although the agency has not given up on the murder theory, its focus is now on the possible suicide as all pointers and evidence indicate in that direction. The agency had also examined the suicide note and came to conclusion that it was in his own handwriting. Also, there were no signs that he was forced to write it, according to a forensic report.
The CBI had handed over the suicide note to General Examiner of Questioned Documents (GEQD) which opined that the suicide note was in Batcha's handwriting and it was not forced, official sources have said.
38-year-old Batcha, who was Managing Director of Greenhouse Promoters, a firm under scanner of CBI and Enforcement Directorate in connection with the 2G spectrum scam, was found hanging in his house at Teynampet in South Chennai on Mar 16 by his wife and driver. He had been questioned in great detail by the CBI on the role of the former telecom minister and other DMK leaders in connection with the 2G case.