Of the total of 18,344 complaints, 937 were from whistle blowers, Minister of State for Personnel, Public Grievances and Pensions V Narayanasamy told the Lok Sabha in a written reply.
The probity watchdog has received 17,128 complaints (including 439 under Public Interest Disclosure and Protection of Informers) in 2010 and 14,725 complaints (377 under PIDPI) in 2009, the Minister said.
"The Commission after careful consideration of all factors and with a view to ensuring promptness in the matters involving vigilance administration has prescribed a period of three months for completing investigation into a complaint and sending the report to the Commission by the Chief Vigilance Officers.
"In so far as PIDPI (also referred to as whistle blowers) complaints, the Commission has prescribed a period of one month for submission of investigation reports," he said.
Besides, 1,216 complaints were sent for investigation and report in the last year as against 1,100 and 1,854 in 2010 and 2009 respectively.
"Commission has noted delay in submission of investigation reports on such complaints. As on December 31, 2011, a total of 1,406 complaints were pending for submission of investigation reports with various ministries, departments or organisations on which reports are awaited," Narayanasamy said.
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In another reply, he said that out of 50 disciplinary cases came for its advice between 2009 and April 2012 the Department of Personnel and Training (DoPT) has agreed with CVC in 13 cases. Also, out of the eight cases came for its advice for sanction for prosecution during the same period, the DoPT had agreed in six cases with the anti-corruption watchdog.
"Every effort is made to convey the advice or decision as soon as possible. The decision or advice is given with the approval of the Minister in Charge of this department,a nd it is observed that the average time taken is around two months in normal course," the Minister said.
The DoPT has not experienced any administrative delay in deciding cases that came for its advice. "However, to fast track cases of sanction for prosecution, it has been recently decided that the views of DoPT would be communicated with the approval of Minister of State for Personnel, Public Grievances and Pensions" Narayanasamy said.