"I met the then Prime Minister Manmohan Singh and registered my concern. My name was being dropped only because of frivolous complaints made by some persons," he said at a function at the launch of his book "Dial D for Don".
Kumar, a 1976-batch IPS officer who retired in July 2013, said there was a need for streamlining the procedure of checking such frivolous complaints so that "honest officers are not punished for no fault of theirs".
"Therefore, I was dropped and of course I was hurt by it. I was perhaps the first serving officer who went to court against it," he said explaining the series of events that unfolded then. His batchmate Ranjit Sinha was chosen as CBI director.
Kumar alleged that the complaints were mainly from a government official and one arms dealer against whom he had carried out through investigations and chargesheeted.
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Talking about underworld don Dawood Ibrahim, Singh said after his tenure in Abu Dhabi had finished, he was tipped for a post as India's High Commissioner in Pakistan.
"One day I received a call from an unknown number who said that he had been instructed by Chhota Rajan (at present in jail) not to go to Pakistan as Dawood's men would eliminate him."
When asked whether there was a possibility of getting Dawood ever to India, Kumar replied, "It is the right set of people who understand each other, who think of viable plan, then it is possible".