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How To Become Sub-Inspector: Delhi Police | CBI | NIA | CBN

Sub-Inspector (SI) is a grade used widely in South Asian Countries like India, which is primarily based on the British model. A Sub-Inspector is generally in command of few police personnel with head constables, the equivalent of corporals and commanding police outposts. SI is the lowest-ranked officer and usually the first investigating officer. He can investigate cases on his behalf but Officers subordinate to him cannot file charge sheets. A Sub-Inspector ranks below an Inspector and above an Assistant Sub-Inspector of Police (ASI). Most Sub-Inspectors are directly recruited into the police and have better academic qualifications than lower-ranking state police officers.

Sub-Inspector: Delhi Police

The Delhi Police (DP) is the law enforcement agency for the National Capital Territory of Delhi (NCT). Delhi Police was one of the largest metropolitan police forces in the world (84,536). Delhi Police comes under the jurisdiction of the Ministry of Home Affairs (MHA), Government of India (unlike other State Police). The headquarters are located at Indraprastha Estate, New Delhi.

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Sub-Inspector in Delhi Police is now enlisted by Staff Selection Commission (SSC) through Central Police Organisation (CPO) Examination every year. The minimum qualification is graduation and the upper age limit is 25 years.

There are four rounds for the examination:

Round-1: Candidate has to clear the Computer Based Test-1. This examination consists of four sections, Quantitative Aptitude, Logical Reasoning, English and General Studies. All sections are of 50 marks each.

Round-2: Ministry of Training and Pension Department will shortlist for the Physical Entrance Test (PET) on the basis of Round-1 performance. This round is all about your physical strength. The candidate has to qualify for all the physical tests.

Round-3: In this round, CBT-2 will be conducted after clearing the PET. CBT-2 consists of an English examination only.

Round-4: Candidate has to clear all the previous stages. A medical test and documents will be verified by the concerned department.

Delhi Police Sub-Inspector is classified as Level 6 (or Group C) and their pay scale ranges between Rs.35400/- and Rs.112400/-.

Sub-Inspector: The Central Bureau of Investigation

The Central Bureau of Investigation (CBI) is the premier investigating agency of India. Operating under the jurisdiction of the Ministry of Personnel, Public Grievances and Pensions, the CBI is headed by the Director. Originally set up to investigate bribery and governmental corruption, in 1965 it received expanded jurisdiction to investigate breaches of central laws enforceable by the Government of India, multi-state organized crime, multi-agency or international cases. The agency has been known to investigate several economic crimes, cases of corruption and special crimes. CBI is exempted from the provisions of the Right to Information Act. CBI is India's officially designated single point of contact for liaison with Interpol. The CBI headquarters are located in CGO Complex, near Jawaharlal Nehru Stadium in New Delhi.


 To become an officer in an elite investigation agency like the Central Bureau of Investigation (CBI) is a dream of many youths in India. To become a Sub-Inspector in CBI, you must pass the Combined Graduate Level Examination (CGL) conducted by Staff Selection Commission (SSC) every year. It is a three-tier examination which includes online objective and descriptive type examinations.

Tier-1 includes General Intelligence & Reasoning, General Awareness, Quantitative Aptitude, and English. Each subject contains an equal number of questions and marks (50).

Tier-2 includes Quantitative Abilities and English Language & Comprehension (both descriptive). Each subject contains an equal number of questions and marks (200). The final stage is document verification. Only after the successful completion of all 3 stages, candidate can join as Sub-Inspector in CBI.

Starting basic pay of a CBI Sub-Inspector is around 45,000 and around 11,000 incentives.  Also, a Sub-Inspector in CBI is paid a salary for 13 months totally, due to overtime, hectic work, and some working Saturdays.

Sub-Inspector: National Investigation Agency

National Investigation Agency (NIA) has been constituted to investigate and control the activities that increase terrorism in the country. Time-wise, NIA was constituted after a severe terrorist attack in Mumbai during 2008 to ensure National Integrity as a permanent law enforcement body. Headquartered at New Delhi, NIA recruits candidates on various posts like Sub-Inspector directly.

The post of Sub-Inspector is very important in the National Investigation Agency (NIA). After selection, candidates are deputed to office-related tasks but gradually after some time they are included in the NIA raid team with upper-rank officials. As a job, the role of Sub-Inspector is very challenging. To become Sub-Inspector in NIA, a candidate needs to be graduated in any discipline from a recognized university or institution. The upper age limit should not be more than 30 years.


Recruitment of Sub-Inspectors in the National Investigation Agency has been done through the Combined Graduate Level (CGL) Examination being conducted by the Staff Selection Commission (SSC). Earlier, candidates for Sub-Inspector in NIA were recruited from those who have completed at least two years of service at national or state level investigative agencies, like CBI or IB. But through SSC CGL Examination is conducted every year, any eligible candidate can apply for these posts directly. The Sub-Inspectors in NIA after selection can be posted and transferred anywhere across the country.

There are three categories in terms of pay-scale. Candidates posted in X category cities get around Rs.43000/- per month initially. In Y category cities they get around Rs.39000/- per month and around Rs.37000/- in Z category cities. Also, the candidates get a salary of 13 months during a year and get many allowances due to a hectic job.

Sub-Inspector: Central Bureau of Narcotics

Sub-Inspector in Central Bureau of Narcotics (CBN) is primarily a job full of responsibility and action. The candidate’s core objective is to keep a strict eye on recent and latest and ongoing activities of the licensed fields of opium and ensure that no illegal activity happening. The candidate also has to actively monitor suspicious hotspots where opium is being cultivated without proper or no license. A Sub-Inspector working in the Central Bureau of Narcotics also assists the District Opium Officer in activities, like Dispatch of Opium Consignment, scanning the area, a regular check of Illegal opium cultivation and ensuring there is no production of narcotics.


Candidate needs to have a complete graduation degree from a recognized college or university if Candidate wishes to apply for the post of Sub-Inspector in Central Bureau of Narcotics. The recruitment procedure for the post of Sub-Inspector in Central Bureau of Narcotics involves Staff Selection Commission (SSC) Combined Graduate Level (CGL) Tier 1 and Tier 2 Examination, followed by document verification of the shortlisted candidates.

Tier 1: The SSC CGL Prelims will be an objective paper (200 marks) with 4 equal sections, which are, Reasoning, General Awareness, Numerical Aptitude, and English Comprehension.

 Tier 2: There will be two exams based on Arithmetical Ability and English Language.

A cumulative score achieved in Tier-1 and Tier-2 SSC CGL Examinations will be considered while creating the merit list. The candidates will be enlisted for the post of Sub-Inspector of Central Bureau of Narcotics after document verification.

Apart from the regular fixed pay, a Sub-Inspector in CBI also enjoys a lot of benefits and allowances. According to current pay scales, the candidate would get a salary of around Rs. 38,000/- per month initially.