Explanation: The functions of CBI are:

• Investigating cases of corruption, bribery and misconduct of Central government employees.
• Investigating cases relating to infringement of fiscal and economic laws, that is, breach of laws concerning export and import control, customs and central excise, income tax, foreign exchange regulations and so on. However, such cases are taken up either in consultation with or at the department’s request.
• Investigating serious crimes, having national and international ramifications, committed by organized gangs of professional criminals.
• Coordinating the activities of the anticorruption agencies and the various state police forces.

Source: Laxmikanth