However, Raja's claims were denied by the CBI's Deputy Superintendent of Police Rajesh Chahal, who was deposing as a prosecution witness in the case.
"It is wrong to suggest that I have not fairly investigated the case. It is wrong to suggest that I have deliberately withheld material evidence which had come in favour of accused persons," Chahal told Special CBI Judge O P Saini.
"It is further wrong to suggest that I had obeyed orders which were not even legal of my superior officers and assisted them in making a false case against the accused.
"It is wrong to suggest that on the directions of my superior officers I intimidated certain witnesses and created a situation in which witnesses were forced to make involuntary statement," Chahal, whose recording of evidence would continue tomorrow, said.
The official told the court that he had arrested Raja in connection with the case "as per the decision of the senior officers of CBI."
Raja, along with others, including DMK MP Kanimozhi, are facing trial for their alleged involvement in the 2G spectrum scam.