Taking up Central Bureau of Investigation chief Alok Verma's case against the government for divesting him of his powers and sending him on forced leave, the Supreme Court today said a vigilance inquiry against him would be time-bound and monitored by an ex-judge. The supervision is a "one-time exception felt necessary in the peculiar facts of the case and should not be understood to be casting any reflection on any authority of the government," the court said. M Nageswar Rao, who was asked to stand in as interim CBI chief, cannot take any policy decision, said the judges. A three-judge bench headed by Chief Justice of India Ranjan Gogoi did not give any ruling on Mr Verma's deputy Rakesh Asthana, who has also challenged his forced leave.