While advancing final arguments, Balwa's counsel told Special Judge O P Saini that CBI did not properly examine the witnesses in the case.
"The prosecution case is contradictory and there is nothing to prove the charges of conspiracy and cheating against me...The prosecution did not examine the witnesses properly and a number of documents are missing from record," advocate Vijay Aggarwal, appearing for Balwa, said.
He had also said that he was prosecuted wrongly and the main charge sheet, filed by CBI, has gone for a toss.
He had also told the court that there were several contradictions in prosecution's story which defy the existence of conspiracy and the CBI has made those persons accused in the case who have not toed its line.
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Besides Raja and Balwa, DMK MP Kanimozhi, former Telecom Secretary Siddharth Behura, Raja's erstwhile private secretary R K Chandolia, Unitech Ltd Managing Director Sanjay Chandra, STPL promoter Vinod Goenka and three executives of Reliance ADAG - Gautam Doshi, Surendra Pipara and Hari Nair - are facing trial in the case.
In its charge sheet, CBI had alleged a loss of Rs 30,984 crore to the exchequer in allocation of 122 licences for 2G spectrum, which was scrapped by the Supreme Court on February 2, 2012.
All these accused, who are out on bail, have denied the allegations levelled against them by CBI.