The Supreme Court has held that CBI does not require the sanction of a state government to register a case under a Central legislation against a Central government employee working within the territory of the state concerned.
It includes the Prevention of Corruption Act and others.
There are two types of consent for a probe by the CBI - General and Specific.
When a state gives a general consent (Section 6 of the Delhi Special Police Establishment Act, 1946) to the CBI for probing a case, the agency is not required to seek fresh permission every time it enters that state in connection with investigation or for every case.
If not, CBI needs to seek case-wise consent for investigation from the concerned state government.
If specific consent is not granted, the CBI officials will not have the power of police personnel when they enter that state.