How to Hire a Private Investigator: A Step-by-Step Guide

Published August 17, 2026

Hiring a private investigator for the first time can feel uncertain. You may not know what investigators can legally do, what to expect from the process, or how to tell a qualified professional from someone who cuts corners. This guide walks you through every stage — from deciding whether a PI is right for your situation to signing a contract and reviewing the final report.

Step 1: Decide Whether You Actually Need a Private Investigator

Before spending money, ask yourself whether a PI is the right tool for your problem. Licensed investigators are well suited for situations such as:

• Locating a missing person or a biological relative
• Documenting evidence of infidelity or behavior relevant to a divorce or custody case
• Conducting background checks on a potential business partner or employee
• Serving legal papers when someone is difficult to locate
• Investigating insurance fraud or verifying someone's claimed activities

If your matter involves potential criminal charges, an ongoing court case, or significant financial consequences, consult a licensed attorney before hiring an investigator. An attorney can tell you what evidence is admissible and how the investigation should be structured to protect your interests. You can find general guidance on working with legal professionals at Nolo, a trusted plain-language legal resource.

Step 2: Verify Licensing in Your State

Private investigators are regulated at the state level, and requirements vary significantly. Most states require PIs to hold an active license issued by a state agency — often a department of public safety, a department of licensing, or a similar body. In Texas, for example, the Department of Public Safety oversees PI licensing, and investigators must meet specific education, experience, and examination requirements.

Never hire an investigator who cannot produce proof of a current license. You can confirm license status through your state's official licensing board or via government look-up tools on USA.gov, which links to state-level agencies and licensing databases. If an investigator is evasive about their license number or discourages you from verifying it, walk away.

Step 3: Understand What Investigators Can and Cannot Do Legally

A reputable PI will be transparent about legal boundaries. Understanding these limits protects you, because evidence gathered illegally is generally inadmissible in court — and you could potentially share in legal liability.

Investigators may legally:

• Conduct surveillance in public places where there is no reasonable expectation of privacy
• Search publicly available records such as court filings, property records, and business registrations
• Interview willing witnesses
• Take photographs or video in public settings

Investigators may NOT legally:

• Trespass on private property
• Record phone calls without the consent required by applicable law
• Access protected databases — such as financial records, medical records, or certain government files — without authorization
• Impersonate law enforcement or other officials
• Install GPS tracking devices on vehicles they do not own or have authorization to track (rules vary by state, so ask specifically)
• Hack into email accounts, phones, or computers

If an investigator offers to obtain records that sound too private to be publicly available, that is a serious red flag. The Federal Trade Commission publishes guidance on background screening and consumer data rights that is worth reviewing if your situation involves a background check.

Step 4: Find and Screen Candidates

Start by identifying two or three licensed investigators to compare. Sources include state licensing board directories, professional association member listings, and referrals from attorneys. Once you have names, vet each one:

1. Confirm the license is current and in good standing.
2. Ask about relevant experience. An investigator who specializes in corporate fraud may not be the best fit for a child custody matter. Request examples of similar work — without expecting them to breach a former client's confidentiality.
3. Check for complaints. Your state licensing board and the Better Business Bureau can show whether formal complaints have been filed.
4. Ask about insurance. A professional PI should carry general liability insurance and, where required, a surety bond.

Step 5: Ask the Right Questions Before You Hire

A good investigator welcomes direct questions. Use the consultation — many offer a free initial call — to ask:

• Are you licensed in the state where the work will be conducted?
• Have you handled cases like mine before?
• What methods will you use, and are all of them legal?
• How will you communicate updates to me, and how often?
• What are your fees — hourly, flat rate, or retainer?
• What expenses are billed separately, such as mileage or database access fees?
• How will you deliver your findings, and in what format?
• Will your report and any evidence be suitable for use in court if needed?

Be cautious of any investigator who makes guarantees about outcomes. Professional investigators gather information — they cannot promise what they will find, and honest ones will tell you so.

Step 6: Review and Sign a Written Contract

Never hire an investigator without a written agreement. The contract should specify:

• The exact scope of the investigation
• The fee structure, including the retainer amount and how it will be applied
• How additional costs are approved and billed
• Confidentiality obligations on both sides
• How and when you will receive updates and a final report
• Conditions under which either party can end the engagement

If any clause is unclear, ask for clarification before signing. For a matter with legal stakes, have your attorney review the contract. General information about service contracts is available at Cornell Law School's Legal Information Institute.

Step 7: Stay Involved Without Interfering

Once the investigation is underway, stay in communication with your investigator but avoid actions that could compromise the work. Do not conduct your own surveillance, confront the subject, or discuss the investigation on social media. Follow your investigator's guidance on what you should and should not do during the engagement.

When you receive the final report, review it carefully. Ask your investigator to explain any findings you do not understand, and discuss next steps — particularly if you plan to use the information in a legal proceeding.

A Note on Costs

Rates vary widely by location, case complexity, and investigator experience. Most PIs charge by the hour and require an upfront retainer. Be realistic: thorough, legal investigative work takes time. Unusually low rates can be a warning sign, just as vague or inflated billing should raise concern.

If you are ready to move forward, you can use this site to request a connection with a licensed private investigator in your area — there is no cost to make the request and no obligation to hire. It is simply a starting point to find a qualified professional and ask the questions that matter to your situation.