How to become a private investigator

1. 1Finish high school and meet the basic rules

   Time: 4 years (high school)Sources 2, 3

   Licensing states such as California and Florida require you to be at least 18 (some states set a higher age) and to pass a criminal background check with fingerprints; serious convictions can bar you. A clean driving record helps, since much of the work is done from a car. Strong writing matters more than most people expect: clients pay for the report, and a sloppy one can sink a case in court.

2. 2Get investigative experience

   Time: 2-3 yearsSources 1, 4

   Most states want verifiable paid investigative experience before you can hold your own license. Common starting points are loss prevention, insurance claims, collections and skip tracing, paralegal work, security, the military or police work. In some states you can work under a licensed agency first: Florida's Class CC intern license requires 40 hours of training and sponsorship by a licensed investigator or agency manager.

3. 3Consider a degree to shorten the experience

   Time: 2-4 years (optional)Cost: About $4,680 a year at public collegesSources 2, 3, 6

   A degree is not required, but some states credit it toward experience. California accepts 5,000 hours of experience instead of 6,000 for applicants with an associate degree in police science, criminal law or justice, and 4,000 hours with a law degree. Florida lets relevant college coursework count for up to one of its two required years. Corporate and financial employers often prefer a bachelor's degree.

4. 4Pass the state licensing exam

   Time: 1-3 monthsCost: $70 in FloridaSources 2, 3

   Where an exam is required, it tests state law more than detective skills: licensing rules, privacy, evidence handling, liability and surveillance limits. California's exam is a two-hour multiple-choice test covering laws and regulations, terminology, civil and criminal liability, evidence, undercover work and surveillance. Florida's Class C exam covers Chapter 493 of the Florida Statutes and must be passed before you apply.

5. 5Apply for the license and choose where to work

   Time: 1-3 monthsCost: State fees varySources 2, 4, 5

   Submit the application, experience verification, fingerprints and fees to your state agency. Then decide whether to work for an investigation agency, a law firm, an insurer or a corporate security team, or to open your own agency, which in many states requires a separate agency license and liability insurance. Renew on your state's schedule and complete any continuing education it requires.

Programs, tuition and graduates’ earnings

U.S. Department of Education, College Scorecard (most recent cohorts, released 2026-10-15). Scorecard groups programs by 4-digit field, so a row can include related programs. Tuition is the median published undergraduate tuition and fees of the colleges offering the program (shown only for undergraduate credentials); debt is the median of programs’ median federal loan debt at completion; earnings are the national median for the field and credential four years after completion.

Requirements differ by state. Check your state’s rules in the CareerOneStop License Finder (U.S. Department of Labor) before you enroll.

Patience

Surveillance can mean ten hours in a car for a few minutes of usable video, and some cases never resolve.

Records research

Most leads come from court files, property records and databases, so knowing where data lives saves days of fieldwork.

Interviewing

Getting a reluctant witness or neighbor to talk, without misrepresenting yourself illegally, is often what cracks a case.

Report writing

Attorneys and insurers judge you by your report, which may be read aloud in court and picked apart by opposing counsel.

Knowledge of privacy law

Recording, GPS tracking, pretexting and trespass rules vary by state, and breaking them can void evidence or lead to charges.

Discretion

Clients share embarrassing and sensitive information, and repeat business depends on keeping it confidential.

O*NET 31.0 rates these skills as most important for the occupation: active listening, speaking, reading comprehension, critical thinking, writing.

Training cost

$70–$9.4K

Before financial aid

Time

3 to 4 years

Typical path

Median pay

$51,220

All US jobs: $50,980

Payback once qualified

0.3–39.3 yrs

Pay above the all-jobs median vs. cost

Low: $70 for Florida's Class C exam, for someone who gains experience on the job at a licensed agency (the required 40-hour intern course and state license and fingerprint fees vary and are not included). High: an associate degree in criminal justice, 2 years x College Scorecard median public in-state tuition of $4,680 = $9,360, plus the $70 exam. State license and fingerprint fees are extra.

Rough guide only: ignores taxes, aid, interest and earnings given up during training. How we calculate it.

• Agency owner

  Experienced PIs open their own firm, which in many states requires an agency license, insurance and sometimes more years of experience.

• Insurance fraud or claims investigator$78,000 median

  Insurers hire investigators into special investigations units; check whether your state also requires an insurance adjuster license for the role.

• Detective or federal investigator$93,790 median

  Moving into public law enforcement means meeting the agency's age, fitness and academy requirements; federal roles usually need a bachelor's degree.

• Paralegal or litigation support$62,890 median

  Investigators who work closely with law firms sometimes add a paralegal certificate to move in-house.

• Forensic science technician$72,060 median

  Requires a bachelor's degree in a natural science or forensic science, since lab work is a separate field.