Start a Mobile Polygraph Examiner Business

Travel to attorneys, agencies and individuals and run polygraph exams in a rented or client-provided private room.

Startup cost$8k to $20k
Monthly revenue$1.2k to $6k
Time needed8+ h/week
First incomeMonths

Estimates for a small start in the US, not guarantees.

Official data

4,013 US businesses with employees in this field, -1.8% in a year

NAICS 561611 “Investigation services”. Source: U.S. Census Bureau, County Business Patterns 2023.

What it is

You carry a polygraph instrument and laptop, interview the person being tested, run the exam and write a report. Exams take place in a private room such as a rented office, a law firm's conference room or a hotel meeting room.

Your first three steps

  1. Check your state's polygraph examiner licensing rules and find a training school that meets them
  2. Complete training and any required internship, then price your exams by comparing local examiners
  3. Introduce yourself to local defense and family law attorneys and offer a short call about how your reports are used
Who pays

Defense and family law attorneys, individuals with personal or legal disputes, and organizations that are legally allowed to use testing. Some examiners also contract with probation or monitoring programs.

How it makes money

A flat fee per exam, often with extra charges for travel, longer multi-issue tests or rush scheduling. Steady referral partners matter more than one-off clients.

Skills that help
  • Calm, neutral interviewing
  • Careful, accurate report writing
  • Discretion with sensitive information
  • Comfortable explaining the process to nervous people
Watch out for
  • Many states license polygraph examiners, check your state's licensing board before taking any paid exams
  • The federal Employee Polygraph Protection Act limits how most private employers can use polygraphs, check which uses are allowed before you accept employer work
  • Professional liability and general liability insurance
  • Results are not accepted as evidence in every court, never promise outcomes to clients
  • Training and equipment are a real upfront cost and it can take months to build referrals

🔒 Full research report for US

Real cost breakdown with current prices, licences and registration checklist, local competition, pricing, break-even and a 30-day launch plan, with sources.

Coming soon

Questions people ask

How much does it cost to start a mobile polygraph business?

Startup costs are typically around $8,000 to $20,000, depending on your training, instrument, laptop and insurance. Training and equipment are a real upfront cost, and it can take months to build referrals, so plan your cash accordingly.

Do I need a license to work as a polygraph examiner in the US?

Check your state's licensing board before taking any paid exams, since many states license examiners. Also check how the federal Employee Polygraph Protection Act limits private employer testing, and look into professional and general liability insurance.

How much can a mobile polygraph examiner earn?

Monthly revenue is typically estimated around $1,200 to $6,000, depending on how many exams you book and how quickly referrals build. The estimate assumes at least about 8 hours a week. Never promise outcomes to clients.

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