The Supreme Court today dismissed a plea challenging the appointment of senior Gujarat cadre IPS officer Rakesh Asthana as a special director of the CBI.<br/> <br/>The petitioner NGO – Common Cause, had opposed Asthana's appointment, saying it was illegal as his name had surfaced in a diary recovered during a raid conducted by the Income Tax department at the offices and other premises of company Sterling Biotech Ltd.<br/>'<br/>The Centre had opposed the plea, saying Asthana had an outstanding career and had supervised over 40 high-profile cases like coal scam, Augusta Westland scam, black money and money laundering cases. The Centre also claimed that Asthana, who was earlier an additional director in CBI, was looking after its eleven zones.