A crime in any State can be assigned to CBI only on
1) A Request by State Government to Central Government requesting CBI investigation
2) Or by an order of High Court or Supreme Court.
Point : Central government has no power of its own to order CBI investigation in any crime happened in any State, unless that State makes a request.
But High Courts and Supreme Court has power to order CBI investigation in any crime even without permission of State Government and Central Government.
Haresh Raichura
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