Narco analysis is a science. Not an Idli sambhar menu, that you will understand. CBI was called 8 days after the murder, when 1. The room was cleaned 2. There was heavy rainfall in North, wiping off evidences on terrece. 3. Line of Investigation of the police was incorrect. Under these circumstances, if CBI undertakes investigation, it is very difficult to prove everything just on the basis of circumstancial evidence. Dont worry abt the corruption ranking. You are also a part of it......Be proud of what you have, rather than cry on what you dont have.