The Central Bureau of Investigation has obtained the sanction to prosecute former Union minister P Chidambaram in the Aircel-Maxis case, but the agency needs to clear a few more hurdles before a court can take up the chargesheet against him. During the last hearing of the case in October, the court had pulled up the agency for filing a chargesheet without proper sanctions. In absence of the other clearances, the agency told the court about the sanction to prosecute Mr Chidambaram at the eleventh-hour -- a day before the court's deadline.