On Nov 5 last year, CBI special court judge R. Reghu termed the investigation agency's chargesheet baseless, and accepted Vijayan's discharge petition, also exonerating all the seven who had filed a discharge petition. The CBI filed the review petition Friday at the Kerala High Court and stated that the CBI court did not go in-depth into the agreement that was signed by Vijayan with the Canadian company, SNC lavalin, in 1997 for renovating three power plants in the state.