Initial evidence procured in the 2G scam was very crucial and it could help the CBI making a robust appeal challenging the trial court order acquitting the accused, said Vinod Rai, former Comptroller and Auditor General (CAG) of India, while indicating the CAG report could have probably helped build a strong case. In a free wheeling interview with IANS, Rai talked about his new book "Rethinking Good Governance: Holding to Account India's Public Institutions". He also talked about his share of controversies in the CAG's 2010 report on the 2G spectrum auction, vehemently defended the report, which concluded a presumptive loss of Rs 1.76 lakh crore to the exchequer.