Deposing as a prosecution witness, CBI's Superintendent of Police Vivek Priyadarshi said not all files seized during the probe from the Department of Telecommunication were filed in the court along with the charge sheet.
He explained that some of the documents were not filed as they were not considered to be relevant to the case.
Priyadarshi denied the suggestion that documents were not filed as they could have "defeated" the agency's case.
"It is wrong to suggest that my investigation has been unfair from the very beginning. It is further wrong to suggest that it is for this reason that I suppressed the CVC report in FIR and charge sheet and never carried out the investigation on the lines contained in the CVC report," Priyadarshi told Special CBI Judge O P Saini.
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On being asked as to whether he had studied each and every document seized and received during the probe, Priyadarshi said, "I read only the relevant portions of the documents, as indicated by the concerned witnesses or the assisting investigating officers."
Priyadarshi's cross-examination will continue tomorrow.
Raja, along with others, including DMK MP Kanimozhi, is facing trial for his alleged involvement in the case.