The CBI today conducted raids at the residence of a former Officer on Special Duty (OSD) to former Union Health Minister Dr Anbumani Ramadoss in connection with alleged irregularities in granting permission to a private medical college at Indore in Madhya Pradesh. A four-member CBI team from Delhi was involved in the searches at the residence of D S Murthy,also a former Intelligence officer,CBI sources said. The searches were in connection with the alleged irregularities in granting permission to the college,they said,but did not divulge further details.