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Mr P Rama Mohana Rao (IAS) made national headline a few months ago, when he was appointed as the chief Secretary, replacing K Gnanadesikan and superseding 20 IAS officials, after Jayalalithaa formed the government in May 2016. He was handpicked by the then government to lead the bureaucracy of Tamil Nadu.
The recent raids conducted at various places by the Income Tax authorities were based on the allegations of Rao having links with sand mining baron J Shekhar Reddy from whose premises in Chennai and Vellore I-T officials seized Rs 134.5 crore in old and new currency notes and 177 kg gold bars worth Rs 50.5 crore a week ago. The raids extended to the premises of Rao's son P Vivek, relatives and associates, spread across 14 locations in Chennai, Bengaluru and Chittoor. They searched Rao's office at the state secretariat for more than five hour and took away 40 documents from Rao's office.
The Income Tax officials said they seized Rs 23 lakh in new currency and Rs 6 lakh in demonetised currency from the premises of some of Rao's relatives and associates, but did not find any unaccounted money at the chief secretary's office or house. From some associates, they found 5kg of gold. 
We don’t know the exact details of the documents seized during the raids which are important to incriminate him in the case.
The Income Tax officials usually don’t raid the top official’s office and residence unless they have strong evidence of the involvement of the officer. It is perhaps the first time that IT officers have raided the top serving government official (Chief Secretary) of a state.
There is no doubt that Mr Rao is going to face lots of trouble after this raid.
He has already been removed as the Chief Secretary and admitted to ICU.