Mumbai, March 22 -- Crucial digital evidence was destroyed a year before the Central Bureau of Investigation (CBI) began its probe into diamantaire Nirav Modi, accused of defrauding Punjab National Bank of Rs13,500 crore. The Enforcement Directorate (ED) said in its charge sheet that the servers of Modi's company Firestar Diamond Inc were shut down after an income tax search in January 2017 and the agency has a witness confirming this. The shutting down of the servers prevented agencies from acquiring the digital evidence contained in email exchanges and online records, states the charge sheet....