Lal, who is also the complainant in the case, told Special CBI Judge O P Saini that he was given the charge of probing this case in January 2013, and there were three investigating officers (IO) who carried out the probe in the case.
"I was supervising this case. There were three IOs, ED's Deputy Director Rajeshwar Singh and ED's Assistant Directors Kamal Singh and Satyendra Singh," he said.
He deposed before the court that he had gone through the FIR and charge sheets filed by CBI in 2G spectrum allocation case and had also read the statements recorded by the ED's IOs under the provision of the Prevention of Money Laundering Act (PMLA) and other relevant documents before filing complaint in the case.
Recording of Lal's statement remained inconclusive and would continue on November 19, the next date of hearing.
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On October 31, the court had put on trial the 19 accused -- 10 individuals and nine companies -- under the provisions of PMLA after they had pleaded not guilty and said that they will face the trial for the charges against them.
The court had framed charges against the accused, saying that Raja allegedly in "connivance" with Kanimozhi, Dayalu Ammal and other co-accused was involved in "parking" of illegal gratification of Rs 200 crore in DMK-run Kalaignar TV.