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How to Become a Detective: Degree, Steps & Salary (2026)
Key takeaway: There are two honest routes to becoming a detective, and they look almost nothing alike: at municipal and county agencies you are promoted or assigned into the role after several years as a sworn patrol officer, while federal criminal investigator positions hire directly from outside and require a bachelor's degree plus qualifying experience. Detectives and criminal investigators earn a national median annual wage of $93,790 (Bureau of Labor Statistics, May 2025 OEWS national median).
“Detective” is a job assignment, not a license. No state issues a detective credential the way it issues a peace officer certification, and no college awards a degree that makes you one. At the local level, detective is a specialized investigative assignment filled from within a department’s own sworn ranks. At the federal level, the equivalent work is done by criminal investigators — FBI, DEA, ATF, HSI, Secret Service, IRS Criminal Investigation, and others — who are recruited from the outside civilian labor market and trained at federal academies.
Which route applies to you determines everything about the preparation: the local path front-loads sworn service and back-loads specialization, while the federal path front-loads education and professional experience. Both are laid out below.
Step-by-step: how to become a detective
Choose the local route or the federal route. Local and county detectives investigate crimes within one jurisdiction and are drawn from patrol. Federal criminal investigators enforce specific federal statutes and are hired directly through competitive announcements. The steps below cover the local path first, then the federal path.
Local route — become a sworn police officer. You must first be hired as a patrol officer, complete a state-certified police academy, earn POST (Peace Officer Standards and Training) certification, and finish field training. This is the same process described in How to Become a Police Officer, including the background investigation, polygraph or psychological screening, and probationary year.
Local route — serve in patrol. Agencies typically require a minimum of two to five years of sworn service before an officer is eligible for an investigative assignment, though the exact threshold is set by department policy or collective bargaining agreement. This time is not a formality: case-building, report writing, interviewing, and courtroom testimony are learned on patrol.
Local route — compete for the assignment. Depending on the agency, detective is either a competitive rank reached through a promotional examination and oral board or a discretionary assignment made by command staff. Where a promotional process exists, scoring commonly combines a written exam, an assessment center or oral board, seniority, performance evaluations, and education points — which is where a degree becomes measurable rather than optional.
Local route — complete investigator training. Newly assigned detectives complete specialized in-service training in areas such as interview and interrogation, crime scene management, search warrant drafting, digital evidence, and case management. Some states require specific POST-certified investigator courses; others leave the curriculum to the agency.
Federal route — meet the education and experience standard. Federal criminal investigator positions are classified in the 1811 job series and require a bachelor’s degree, with additional qualifying professional experience for most entry grades. Agencies set their own overlays: the FBI, for example, requires a bachelor’s degree plus a minimum period of full-time professional work experience, applies an age window for entry, and requires U.S. citizenship and a Top Secret security clearance.
Federal route — pass the assessment and background process. Expect a multi-phase written and situational assessment, a structured interview, a physical fitness test, a medical examination, a polygraph, a drug screen, and a full-field background investigation for clearance. This process routinely runs a year or longer.
Federal route — complete the federal academy. Successful applicants complete basic criminal investigator training at a federal academy — most agencies at the Federal Law Enforcement Training Centers in Glynco, Georgia, and the FBI at Quantico, Virginia — typically several months of residential training, followed by a field office probationary period.
What degree do you need to be a detective?
For the local route, the same answer as patrol: no degree is legally required in most agencies, because entry is through police officer hiring. For the federal route, a bachelor’s degree is a hard requirement.
- An online bachelor’s in criminal justice is the practical baseline for anyone targeting investigations. It is required for federal 1811 positions and carries measurable weight in local promotional scoring.
- A bachelor’s in forensic science or a science major is the better fit if you are drawn to evidence work; some federal investigative roles, particularly in financial and cyber units, favor accounting, finance, or computer science backgrounds instead.
- An online master’s in criminal justice supports movement into supervisory investigative command or into policy and training roles, and in agencies with education-point systems it can substitute for a portion of experience.
Because detective is reached mid-career at the local level, most officers complete the degree online while working shift schedules. See Criminal Justice Careers and Jobs for how investigative roles sit alongside the rest of the field.
How much do detectives make?
Detectives and criminal investigators earn a national median annual wage of $93,790 (Bureau of Labor Statistics, May 2025 OEWS national median). That figure covers both local detectives and federal criminal investigators, which is one reason the range around it is wide — federal 1811 positions carry law enforcement availability pay on top of base salary, while local detective pay is governed by municipal salary schedules.
View the data behind this chart
| Percentile | Annual wage |
|---|---|
| 10th percentile | $55,390 |
| 25th percentile | $69,330 |
| Median | $93,790 |
| 75th percentile | $120,520 |
| 90th percentile | $160,540 |
View the data behind this chart
| State | Median annual wage |
|---|---|
| District of Columbia | $160,760 |
| Maryland | $126,730 |
| California | $124,840 |
| Delaware | $122,050 |
| New Jersey | $116,300 |
| Washington | $115,790 |
| Alaska | $114,940 |
| Hawaii | $113,940 |
For comparison within the same career ladder, police and sheriff’s patrol officers earn a national median annual wage of $76,210, and first-line supervisors of police and detectives earn $106,040 (Bureau of Labor Statistics, May 2025 OEWS national medians). The step from patrol to investigations and then to supervision is the shape of the local pay progression.
How long does it take to become a detective?
The local route realistically takes five to eight years from your first application; the federal route takes about five to seven years if you start from high school, or one to two years if you already hold a qualifying degree and experience.
| Route | Typical duration |
|---|---|
| Local: hiring, academy, and field training | 1 to 2 years |
| Local: required patrol service before eligibility | 2 to 5 years |
| Local: promotional process and investigator training | 6 to 18 months |
| Federal: bachelor’s degree | About 4 years |
| Federal: qualifying professional experience | 1 to 3 years, varies by agency and grade |
| Federal: application, clearance, and academy | 1 to 2 years |
These are ranges. Detective openings at a local agency depend on vacancies and are not scheduled on a predictable cycle, and federal hiring announcements open and close at the agency’s discretion.
Frequently asked questions
What degree do you need to be a detective?
It depends on the route. Local and county detectives are promoted from sworn patrol positions, and most of those agencies require only a high school diploma or GED to be hired in the first place. Federal criminal investigator positions in the 1811 series require a bachelor’s degree, and many require qualifying professional experience on top of it.
How long does it take to become a detective?
At a local agency, plan on five to eight years: one to two years to be hired and complete academy and field training, two to five years of required patrol service, then a competitive promotional or assignment process. The federal route takes about five to seven years from high school, since it requires a bachelor’s degree, qualifying experience, and a lengthy clearance and academy process.
Do you need a degree to be a detective?
Not for the local route in most agencies, where investigative assignments are filled from within the sworn ranks and the hiring floor is a high school diploma or GED. Yes for federal criminal investigator positions, where a bachelor’s degree is a stated qualification requirement. Even where it is not required, education is frequently a scored factor in local promotional processes.
How much do detectives make?
Detectives and criminal investigators earn a national median annual wage of $93,790 (Bureau of Labor Statistics, May 2025 OEWS national median). That median spans local detectives and federal criminal investigators, whose pay structures differ considerably.
Can you become a detective without being a police officer first?
At a municipal or county agency, generally no — detective is an assignment within the sworn ranks, so you must first be hired and certified as a police officer. Federal criminal investigator positions are the exception: they hire directly from outside law enforcement, which is why applicants with accounting, cyber, language, or military backgrounds are competitive without prior police service.
Is a private investigator the same thing as a detective?
No. Private investigators are licensed by state regulatory agencies, hold no arrest authority, and work for private clients. The BLS occupation discussed on this page covers sworn detectives and federal criminal investigators, who exercise law enforcement authority and are certified or appointed by government agencies.
Related guides
- Online Criminal Justice Degrees Guide — the full hub covering every degree level and concentration
- Online Bachelor’s in Criminal Justice — the required credential for federal investigator roles
- Criminal Justice Careers and Jobs — how investigative work compares with other criminal justice paths
- How to Become a Police Officer — the required first step on the local route
- How to Become a Crime Analyst — the civilian analytical role that supports investigations
Wage figures on this page come from the U.S. Bureau of Labor Statistics Occupational Employment and Wage Statistics (May 2025 national medians). Promotional eligibility, investigator training requirements, and federal hiring standards are set by individual agencies; confirm requirements directly with the agency you intend to apply to.
Data verified: August 12, 2026. Salary, employment, and tuition figures on this page are sourced from the U.S. Bureau of Labor Statistics (OEWS May 2025; Employment Projections 2024–2034) and the U.S. Department of Education College Scorecard (2023 cohort). The source agency and data year are cited inline with every statistic.
Back to Online Criminal Justice Degrees Guide: Programs and Career Paths