"Instead of procuring scan, X-ray and ECG machines from the manufacturers, the Government purchased sub-standard machines from two private companies, leading to suspicion of irregularities," he told reporters here.
Considering this, the Chief Minister should order a detailed enquiry into the purchase of such machines during the last five years, he said.
He also alleged that the State government was trying to protect the ministers and officials, who are in the Income Tax department's radar.
Subramanian had collapsed when he was visiting his farm at Mohanur that day. Labourers there took him to a government hospital were doctors declared him brought dead.
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His house in Nammakkal district was also searched during the raids on April 7.
On the murder of a security guard in the Kodanadu estate bungalow of late Chief Minister Jayalalithaa, Raja said only a CBI probe would bring out the truth as a state government investigation would lead to suspicion in the minds of the public.
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