Hiring a Private Investigator: What They Can Legally Do & What It Costs (2026)

Most people arrive at the decision to hire a private investigator with an idea shaped almost entirely by television: a licensed operator who can pull anyone's bank records, tap a phone, tail a car with a tracker, and make an arrest at the end of the third act. Almost none of that is real. A private investigator in the United States is a licensed (in most states) civilian who gathers information and documents it well enough to be used — by a lawyer, an insurer, a court, or you. The skill is not in secret access to forbidden databases; it is in surveillance discipline, public-records fluency, interviewing, and producing a report and a chain of evidence that survives a challenge. This guide is written for the person doing the hiring: what a PI can legally do, what they cannot, how licensing works state by state, what it actually costs, how to vet a firm, and when you should be calling a lawyer first instead.

What a private investigator can legally do

Start with the affirmative side of the ledger, because it's larger than most people expect. A competent, licensed investigator working entirely within the law can do all of the following, and the results are often decisive:

• Surveillance from public vantage points. An investigator can sit on a public street, in a parking lot open to the public, or anywhere else they have a lawful right to be, and observe, photograph, and record video of what is plainly visible. This is the core product of the profession. What matters legally is whether the subject had a reasonable expectation of privacy in what was captured — a person walking into a restaurant does not; a person inside their own bathroom does, regardless of where the camera was standing.
• Public and court records research. Civil and criminal court filings, judgments and liens, bankruptcies, property and deed records, business registrations and corporate officers, UCC filings, professional licenses, marriage and divorce records where public, and sex-offender registries. A large share of a good investigation is nothing more exotic than someone who knows which county clerk to call.
• Licensed-access database research. Investigators subscribe to commercial data aggregators that compile public and semi-public records. Access to these is restricted by law, and legitimate use depends on having a permissible purpose — which is exactly why a licensed firm can use them and a stranger on the internet cannot.
• Motor-vehicle records for permissible purposes. The federal Driver's Privacy Protection Act (18 U.S.C. § 2721) prohibits releasing personal information from state DMV records except for a defined list of permissible uses, which include use in connection with a civil, criminal, or arbitral proceeding, service of process, and investigation in anticipation of litigation. A licensed investigator with a genuine litigation purpose may access those records; one running a "curiosity" search for a jealous client is committing a federal violation.
• Skip tracing and locating people. Finding a debtor, an heir, a missing witness, a birth parent, or a defendant who needs to be served — assembled from address histories, utility and credit-header data, property records, employment traces, relatives, and social media.
• Interviews and statements. Voluntarily approaching and interviewing witnesses, neighbors, former employers, and third parties, and taking signed or recorded statements.
• Process service. In many states a PI license also allows (or is paired with a registration allowing) service of legal documents, which is why a lot of investigation firms serve process as a companion line.
• Undercover and pretext work within legal limits. An investigator may pose as an ordinary customer, an applicant, or a member of the public in many contexts — retail integrity shops, employee-theft cases, counterfeit-goods buys. The line, discussed below, is that they cannot impersonate someone in order to extract legally protected records.
• Evidence assembly and testimony. Producing a written report, a documented chain of custody for photographs and video, timestamped logs, and — when the case is tried — appearing as a witness to authenticate what they collected.

Notice what unites all of it: the investigator is a skilled civilian with time, patience, methodology, and lawful access. That's the product you're buying.

What a private investigator cannot do — the myths, itemized

This is the highest-value section of this guide, because more clients get in trouble by asking for the illegal thing than by hiring the wrong firm. Every item below is a hard limit, and a firm that offers to do any of them is telling you something important about how it operates.

• No arrest powers. A private investigator is not a peace officer. They have no more authority to detain or arrest than you do — at most the citizen's-arrest authority any private person has in that state, which is narrow and legally risky to exercise. They cannot compel anyone to answer questions, cannot detain a subject, and cannot demand identification.
• No wiretapping. The federal Wiretap Act (18 U.S.C. § 2511) makes it a crime to intentionally intercept a wire, oral, or electronic communication. Federal law permits recording where at least one party to the conversation consents — but roughly a dozen states, California among them, require all parties to consent, and an investigator who is not a party to the call cannot consent on anyone's behalf. Bugging a room your target occupies, or intercepting their calls, is criminal in every state.
• No bank, credit, or financial records. Under the Gramm-Leach-Bliley Act (15 U.S.C. § 6821), it is unlawful to obtain or attempt to obtain customer information of a financial institution by making a false, fictitious, or fraudulent statement to the institution or to the customer — the practice known as pretexting. Section 6823 attaches criminal penalties. Any investigator who says they can "get the account balances" is describing a federal crime, and the person who hired them for that purpose is not in a comfortable position either.
• No phone records. The Telephone Records and Privacy Protection Act of 2006 (18 U.S.C. § 1039) makes it a federal crime to obtain confidential phone records by fraud or false pretenses, or to sell or transfer records obtained that way. Call logs are not available to a PI.
• No hacking, no email or account access. The Computer Fraud and Abuse Act (18 U.S.C. § 1030) and the Stored Communications Act (18 U.S.C. § 2701) criminalize accessing a computer or a stored electronic communication without authorization. Reading a spouse's email, guessing into a cloud account, or installing spyware on someone else's phone is a crime — and clients are prosecuted for this far more often than they expect.
• No trespass. An investigator may not enter private property to observe, plant a camera, or retrieve anything. That includes fenced yards, locked garages, gated communities, secured office floors, and increasingly the area immediately around a home. Trash placed at the curb for collection is generally treated differently from trash inside the curtilage of a home, but state law varies and this is a question for counsel, not an assumption.
• Sharply limited GPS tracking. This one costs firms their licenses. Placing a tracker on a vehicle the client does not own is unlawful in many states — California, for example, makes it a crime to use an electronic tracking device to determine the location or movement of a person, with an exception for the registered owner or lessor of the vehicle (Cal. Penal Code § 637.7). "My spouse drives it" is not the test; whose name is on the title, and in community-property and co-titled situations, whether both parties are owners, is the test. Assume no tracker without written legal clearance for your specific state and facts.
• No impersonating law enforcement. Badges, "official" language, uniforms suggesting police authority — criminal in every state, and it also contaminates everything collected afterward.
• No sealed, juvenile, or expunged records; no protected medical information. Sealed and expunged records are unavailable by definition. Medical records are protected by HIPAA and, as a practical matter, are obtained through subpoena or a signed release by a party — not by an investigator.
• No guaranteed outcome. Not a legal prohibition, but a professional one. An investigator sells hours and method, not results, and any promise otherwise is a sales tactic.

Licensing: it is state-by-state, and some states have none

There is no federal private-investigator license in the United States. Regulation is entirely at the state level, and the variation is enormous — different agencies, different experience thresholds, different exam requirements, different bonding and insurance floors, and in a handful of states no statewide requirement at all. Some states run PI licensing through the same body that licenses security guard companies; others split them entirely.

Colorado is not alone. Six states have no statewide private-investigator license: Alaska, Colorado, Idaho, Mississippi, South Dakota and Wyoming. South Dakota's Attorney General and Wyoming's Division of Criminal Investigation both say so directly; Idaho and Mississippi have never enacted a scheme; and Colorado repealed the one it had. Be careful with lists you find elsewhere — several widely-cited directories still describe Colorado's defunct Level I/Level II licensing as if it were current, and some still list Alabama, which has in fact licensed private investigators since 2013 and added agency licensing in 2024.

"No state license" is not the same as "unregulated," and this is where buyers in these six states go wrong. Several cities license investigators directly, sometimes with a bond requirement stiffer than a state scheme would impose — Anchorage and Fairbanks in Alaska, Cheyenne in Wyoming, and Pocatello in Idaho all license detective or investigative businesses at the municipal level. So the first question in an unlicensed state is not "is there a license?" but "is there a license here?"

The practical consequence for a buyer is straightforward: where no license applies, the license check that would normally do your vetting for you does not exist, and you must substitute other diligence — insurance certificates, references, professional-association membership, verifiable case history, and a written contract. Colorado is the sharpest illustration: since the repeal there is no bond requirement, no insurance minimum and no state body with authority to take your complaint, so the contract and the certificate of insurance are the only protection you have.

What people actually hire private investigators for

The caseload of a typical American investigation firm is more mundane and more commercial than the fiction suggests. These are the categories that make up most of the work:

• Infidelity and domestic cases. Still a meaningful share of consumer-side work. The deliverable is surveillance documentation — timestamped video and photographs, a written activity log, and a report. Note that most states are no-fault divorce jurisdictions, so proof of an affair often has less legal effect than clients assume; where it matters is in custody disputes, in cases involving marital-asset dissipation, or simply in giving a client certainty before making a decision.
• Background checks and pre-employment screening. Criminal history, employment and education verification, licensing, litigation history, and reference interviews. This is the category with the biggest legal trap for buyers — see the FCRA section below.
• Insurance fraud and workers' compensation surveillance. A large institutional book of business. Investigators document a claimant's actual physical activity over multiple days, often the single highest-value use of surveillance because the deliverable is video that speaks for itself.
• Skip tracing and asset location. Finding people who don't want to be found, and finding what they own — used by creditors, judgment holders, and litigants trying to establish whether a defendant is collectible before spending money on a lawsuit.
• Business due diligence. Vetting a prospective partner, franchisee, acquisition target, executive hire, or major investor: undisclosed litigation, prior business failures, regulatory actions, misrepresented credentials, undisclosed conflicts. Comparatively cheap insurance against a very expensive mistake.
• Child custody and welfare. Documenting the actual living conditions, supervision, and behavior in a co-parent's household. Sensitive, heavily scrutinized by courts, and the category where illegally obtained evidence does the most damage to the client who commissioned it.
• Litigation support. Witness location and interviewing, service of process, scene documentation, records retrieval, and trial-exhibit preparation, usually working directly for a law firm.
• Corporate internal investigations. Employee theft, intellectual-property leakage, expense fraud, harassment complaints, and workplace-threat assessment — often overlapping with the physical-security program described in our contracts and insurance guide.
• Counter-surveillance and TSCM. Sweeping a vehicle, office, or residence for listening devices, trackers, and spyware — a growing consumer category as tracking hardware has become cheap.

Background checks and the FCRA trap

If you are hiring an investigator to run a background check that will be used to make a decision about employment — hiring, promotion, retention, reassignment — you have stepped into the Fair Credit Reporting Act (15 U.S.C. § 1681), and the rules change entirely. A background report prepared by a third party for employment purposes is a "consumer report," and the third party preparing it is a consumer reporting agency. That means the employer must provide a clear, standalone written disclosure that a report may be obtained, get the applicant's written authorization, certify to the agency that the report will be used for a permissible purpose and not in violation of anti-discrimination law, and — before taking an adverse action based on the report — provide a pre-adverse-action notice with a copy of the report and the FTC's "A Summary of Your Rights Under the Fair Credit Reporting Act," then a separate adverse-action notice afterward.

The same framework applies to tenant screening and to reports used for certain credit or insurance decisions. It does not apply to, say, a private due-diligence look at a prospective business partner in a purely commercial transaction. The distinction matters because FCRA carries statutory damages and has generated a great deal of class litigation, most of it over the mechanics of the disclosure form rather than the content of the report. Ask any investigator you hire for employment screening a direct question: are you operating as a consumer reporting agency for this engagement, and will you provide FCRA-compliant disclosure, authorization, and adverse-action templates? A firm that looks blank at the question should not be doing your hiring screens.

What hiring a private investigator costs

Investigation is sold as time plus expenses, and the honest way to read a quote is to separate the three components: the hourly rate, the minimum block, and the pass-through costs. The figures below are typical US market ranges observed in agency rate cards and industry surveys, not verified government statistics — treat them as a budgeting frame, and get a written quote for your specific case.

What moves your number up or down:

• Market. An investigator in a high-cost metro bills materially more than one in a small market, for the same reason every other service does.
• Investigator background. Former federal agents, forensic accountants, and specialists in a niche (IP, maritime, cyber) sit at the top of the range.
• Surveillance difficulty. A subject with a fixed routine in a suburb is cheap to document. A mobile subject in Manhattan, or one who is counter-surveillance aware, may require two or three investigators and multiple vehicles.
• Timing. Overnight, weekend, holiday, and rush engagements carry premiums.
• Travel. Out-of-area work adds mileage, drive time, and sometimes lodging — and may require a locally licensed affiliate.
• Deliverable depth. A verbal update is cheaper than a court-ready report with an authenticated video exhibit and a testifying witness. Decide up front which one you're buying.

One structural point worth internalizing: surveillance is inherently uncertain, and you pay for the attempt. A six-hour surveillance where the subject never left the house still costs six hours. Reputable firms tell you this before taking the retainer and will discuss expected hit rates for your kind of case. Firms that don't mention it are setting up a difficult conversation on the second invoice.

How to vet a private investigator before you hire

Run the same discipline you'd apply to any professional services purchase, adapted to the specifics of this field:

• Verify the license in the state of the work. Look the firm and the individual up on the state regulator's public search, and read the expiration date and any disciplinary history rather than just the headline status. Some state lookups display only active licenses, so a "no result" can itself mean a lapsed or revoked credential rather than a typo.
• Confirm insurance — general liability and E&O. Ask for a certificate of insurance naming current dates. General liability covers bodily injury and property damage; professional liability / errors and omissions is the one that matters most here, because the realistic claim against an investigator is a negligent or unlawful investigation, not a slip-and-fall. Many states set a bond or insurance floor for licensure; that floor is a minimum, not a recommendation.
• Ask how the evidence will hold up. A direct, revealing question: "If this ends up in court, how do you authenticate this video, and have you testified before?" You want to hear about timestamped continuous footage rather than clipped highlights, contemporaneous field notes, a documented chain of custody for original media, and actual deposition or trial experience. An investigator who has never testified is not disqualified, but you should know it going in.
• Get a written contract with a defined scope. It should specify the objective, the hourly rate and any minimums, the retainer and how it's drawn down and replenished, which expenses are passed through and at what rate, the reporting cadence and format, confidentiality obligations, who owns the work product, and how to terminate. Nothing about this should be verbal.
• Ask what they will refuse to do. The best proxy for professionalism. A seasoned investigator will readily list the things they won't touch — trackers on cars the client doesn't own, phone records, bank balances, entering property — and will explain why. An investigator with no boundaries has no boundaries with your case either.
• Check independent reputation. State disciplinary records, court records for suits against the firm, professional associations, and references from attorneys who have used them — attorney references are the most informative kind, because lawyers are repeat buyers who see how the work performs under pressure.
• Confirm who actually does the work. At larger firms, the person who sells you the case is often not the person sitting in the car at 5 a.m. Ask who is assigned, what their background is, and whether any of the work is subcontracted.

When you need a lawyer instead — or first

A meaningful share of people who call an investigator should be calling an attorney, and in several situations you get a better outcome by hiring the investigator through counsel rather than directly.

The reason is privilege. Communications between you and your investigator are not privileged. Your investigator can be deposed, and the reports you commissioned directly are generally discoverable by the other side. When a lawyer retains the investigator as part of preparing your case, the work is far more likely to be protected as attorney work product — material prepared in anticipation of litigation, which under Federal Rule of Civil Procedure 26(b)(3) and its state analogues receives qualified protection from discovery. If your matter is heading toward a courtroom — divorce and custody, a personal-injury or fraud claim, an employment dispute, a business dissolution — retaining the PI through your lawyer costs nothing extra and can keep an unhelpful interim finding out of the opposing party's hands.

Beyond privilege, go to a lawyer first when: you're contemplating anything near the legal edge (trackers, recordings, accessing shared accounts) and need a state-specific answer before you act; you're a victim of stalking, harassment, or domestic violence, where the right first calls are law enforcement and a protective-order attorney, with an investigator supporting rather than leading; you're screening for employment and need the FCRA process built correctly; or you need records that only a subpoena can produce — medical files, employment files, financial institution records. That last point is worth stating plainly: the things a PI cannot legally obtain are frequently obtainable by your lawyer through lawful discovery. The investigator's job is the evidence that discovery can't reach — what someone actually did, on video, on a Tuesday.

Getting a useful result from the engagement

Clients who get good outcomes tend to do three things. First, they define a decision, not a feeling: "I need to know whether he is at the second address on weeknights" is a scope an investigator can price and execute; "find out what's going on" is not. Second, they hand over everything they already know at the start — addresses, vehicles and plates, work schedule, photographs, social accounts, routines. Every hour the investigator spends rediscovering what you already knew is an hour you paid for. Third, they set a budget ceiling and a checkpoint: a defined number of hours, then a conversation about whether to continue. Surveillance without a checkpoint is how a $2,000 engagement becomes an $11,000 one.

And be honest with yourself about the deliverable. The most common disappointment in this business is not a bad investigator — it's a client who paid for three days of surveillance expecting a confession and received an accurate, well-documented report that the subject went to work and came home. That report is a real answer. It is often the answer that was worth buying.

Ready to move forward? Compare licensed, insured providers through our private investigation services directory, and get free quotes from licensed investigators in your state — describe the case, the jurisdiction, and your budget range, and let two or three firms tell you in writing what they'd actually do.