Certain physical standards are prescribed for officers in this service. On selection, candidates undergo a foundation course at the Lal Bahadur Shastri Academy and are sent to the CBI Training Academy at Ghaziabad for further inputs.

A DSP can rise up to the level of Joint Director in the CBI.

At the lower rung, personnel of the rank of constables are recruited by the bureau through notifications in leading national dailies. Eligibility is matriculation.

The Staff Selection Commission (SSC) recruits personnel of the rank of Sub-Inspectors. The basic qualification for taking the selection test (written exam and interview) is graduation plus certain standard physical requirements. The age requirement is 20-25 years. Sub-Inspectors can rise up the ladder to become Inspectors, Deputy Superintendent of Police (DSP), Superintendent of Police (SP), etc. However, a substantial number of posts at the middle and higher levels are filled through "deputation" (temporary 5-10 year posting) of IPS (Indian Police Service) officers from various states who have a thorough experience in investigation.

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