MUMBAI, April 14 -- The Central Bureau of Investigation (CBI) has booked a Central Goods and Services Tax (CGST) superintendent for demanding and accepting a bribe of Rs.15 lakh from a private firm owner in lieu of diluting a departmental probe against the firm. The CGST superintendent, M Sharma, was booked by the CBI on Friday, along with the firm owner and another person, after a preliminary inquiry confirmed that he had accepted the bribe in August last year, officers familiar with the matter said. The CBI case was registered under sections of the Bharatiya Nyaya Sanhita and the Prevention of Corruption Act pertaining to criminal conspiracy, taking undue advantage to influence a public servant by corrupt or illegal means or by exercising personal influence and paying bribe to any public servant....