Before hiring a private investigator, confirm they are licensed in your state, get the scope and billing in writing, and understand that federal and state laws limit what they can legally do on your behalf. Those three checks decide whether the money you spend produces evidence you can use or a problem you have to defend.
What You Can Reasonably Ask a PI to Do
The work falls into a few practical categories. Investigators recover deleted text messages, emails, and social media posts that become evidence in litigation, and courts increasingly treat electronic communication as the primary record of someone’s intent or behavior. They document the daily activities of insurance claimants, capturing video that insurers use to challenge fraudulent claims. They run skip traces to locate people who have moved to avoid debts or service of process, using proprietary databases, utility records, and public filings, then physically confirming the person’s identity. And they perform deep-dive background checks on executive candidates that go well beyond a criminal records search to include financial histories, prior litigation, professional reputation, and potential conflicts of interest.
Knowing which of these buckets your situation fits helps you evaluate whether the investigator you’re talking to has the right experience. A firm that mostly runs corporate backgrounds is not necessarily the right choice for a multi-day surveillance case, and vice versa.
Verify the License First
Most states require private investigators to hold a license issued by a regulatory board or state agency. The typical application involves a criminal background check, proof of relevant work experience (often two to three years), fingerprinting, and sometimes a surety bond in the range of $5,000 to $10,000. If your state has a licensing board, its database is the single easiest way to screen for legitimacy.
Roughly six states, including Alaska, Idaho, Wyoming, Mississippi, South Dakota, and Colorado, have no statewide licensing requirement. Some of those leave regulation to individual cities, so an investigator working in Anchorage or Denver might still need a local permit even though the state doesn’t issue one. If you’re in one of those states, ask what local credential the investigator carries and how you can confirm it.
Cases That Cross State Lines
A PI license from one state generally doesn’t authorize work in another. A handful of states have entered into limited reciprocity agreements that let out-of-state investigators handle cases originating in their home state without a second license, but these arrangements are narrow. North Carolina, for example, has reciprocal agreements with seven states, limits out-of-state investigators to 30 days per case, and prohibits them from soliciting local business or opening an office.1North Carolina Department of Public Safety. States with Limited Reciprocity If your case will require work in more than one state, ask the investigator upfront how they intend to handle licensing in each jurisdiction.
What a Private Investigator Cannot Do for You
The most common misconception is that PIs have some version of police authority. They don’t. They cannot make arrests, carry badges suggesting law enforcement affiliation, or compel anyone to answer questions. Impersonating a police officer is a criminal offense in every state.
Trespassing is another hard line. An investigator can photograph a subject from a public sidewalk, but stepping onto private property to peer through a window crosses into criminal territory. The same goes for breaking into a locked vehicle, opening someone’s mail, or entering a building under false pretenses to plant a recording device.
Intercepting phone calls, emails, or other electronic communications without authorization is a federal crime under the Wiretap Act, punishable by a fine, up to five years in prison, or both.2Office of the Law Revision Counsel. 18 USC 2511 – Interception and Disclosure of Wire, Oral, or Electronic Communications Prohibited Many states impose even stricter rules, requiring all parties to a conversation to consent before it can be recorded. Hacking into email accounts, social media profiles, or computer systems is illegal regardless of who does it; an investigator can review anything publicly posted, but accessing a private account by guessing passwords or using phishing tactics violates federal computer fraud laws. Any evidence obtained that way is likely inadmissible and could expose both the investigator and the client to prosecution.
GPS tracking varies dramatically by state. A growing number of states prohibit placing a tracking device on a vehicle without the owner’s consent, though a few carve out narrow exceptions for licensed investigators.3National Conference of State Legislatures. Private Use of Location Tracking Devices: State Statutes Before assuming a PI can put a tracker on a car, ask them to explain the specific law in your state. If they can’t, that tells you something.
Federal privacy statutes also govern what an investigator can pull from third-party databases. The Fair Credit Reporting Act limits who can access a consumer report and for what purpose, allowing use only for reasons like a credit transaction, employment screening with the subject’s written consent, insurance underwriting, or a court order.4Office of the Law Revision Counsel. 15 USC 1681b – Permissible Purposes of Consumer Reports A willful violation carries statutory damages of $100 to $1,000 per violation plus punitive damages and attorney fees.5Office of the Law Revision Counsel. 15 USC 1681n – Civil Liability for Willful Noncompliance The Driver’s Privacy Protection Act allows licensed PIs to access motor vehicle records, but only for authorized purposes such as investigating in anticipation of litigation, serving process, pursuing fraud, or verifying information submitted to a business.6Office of the Law Revision Counsel. 18 USC 2721 – Prohibition on Release and Use of Certain Personal Information From State Motor Vehicle Records Financial data received under a Gramm-Leach-Bliley exception can only be used for the purpose it was provided, not repurposed or sold.7Federal Trade Commission. How To Comply with the Privacy of Consumer Financial Information Rule of the Gramm-Leach-Bliley Act
What to Bring to the Consultation
The quality of information you bring directly affects how quickly and cheaply the investigation wraps up. At minimum, have the subject’s full legal name, any known aliases, date of birth, and last known address. Vehicle details like a license plate number and make or model are valuable for surveillance work. A Social Security number dramatically narrows database searches.
More important than the data is a clear objective. There’s a meaningful difference between “I want to know if my spouse is cheating” and “I need admissible evidence of infidelity for a fault-based divorce filing in my state.” The first goal might take a few days of surveillance. The second requires careful chain-of-custody procedures and documentation that meets evidentiary standards. Defining what you actually need the information for lets the investigator choose the right methods and give you an honest time estimate.
During the initial meeting, a good investigator will tell you whether your goal is realistic and legal. This is where you want to hear honest pushback, not promises. If someone guarantees results before reviewing your situation, walk away.
The Retainer, the Hourly Rate, and the Hidden Charges
Most investigators charge by the hour, with rates typically falling between $75 and $200 depending on the complexity of the work and the local market. Surveillance in a major metro area costs more than a database search from a desk. Straightforward record searches and basic background checks are often billed at a flat fee.
Beyond the base rate, expect incidental charges for mileage, database access, video editing, and report preparation. These can add 15 to 30 percent to your total bill if you’re not paying attention. Ask for a written breakdown of what’s included in the hourly rate and what gets billed separately before signing the retainer. Some firms bill database searches as a separate line item each time they run a query through platforms like TLO or IRB; others fold those costs into the hourly rate. A reputable firm won’t be cagey about this.
Once the retainer is paid, most investigators provide periodic updates or daily logs detailing progress and any evidence collected. The process concludes with a formal report you can use in court proceedings or for private decision-making.
How Long the Work Takes
A basic background check might come back in a day or two. Skip tracing typically takes one to two weeks when the subject has deliberately tried to disappear. Surveillance cases are the hardest to predict because they depend on the subject’s patterns and cooperation from the weather. Budget for the possibility that surveillance runs beyond the initial estimate.
Making Sure the Evidence Will Hold Up
Evidence collected by a PI is only useful if it’s admissible. The two things that kill admissibility most often are broken chain of custody and illegal collection methods.
Chain of custody means every piece of evidence, whether a photograph, a hard drive, or a surveillance video, is tracked from the moment it’s created. The documentation needs to show who collected it, when, where, how it was stored, and every person who handled it before it reached the courtroom. If there’s a gap, opposing counsel will argue the evidence could have been tampered with, and judges routinely exclude it.8NCBI Bookshelf. Chain of Custody
If your case goes to trial, the investigator may need to testify about what they observed or how they collected evidence. Under Federal Rule of Evidence 702, a witness can testify as an expert if their testimony is based on sufficient facts, uses reliable methods, and applies those methods correctly.9National Institute of Justice. Law 101: Legal Guide for the Forensic Expert – Expert Witnesses An experienced investigator with proper credentials and documentation generally qualifies. Someone who cut corners on evidence handling probably won’t. Ask, before you hire, how the firm documents chain of custody and whether the assigned investigator has testified before.
Your Liability If Things Go Wrong
Hiring a PI does not insulate you from legal consequences when the investigation goes sideways. If the investigator invades someone’s privacy or commits another tort during the work you hired them to do, you may face civil liability alongside them. Courts have held that a client can be liable for intentional torts committed by the agency’s employees during the investigation, and separately liable for negligent supervision if the client knew or should have known the investigator might cross legal lines.
That is why vetting matters as much as it does. Verify the license through the state regulatory database, confirm the investigator carries professional liability insurance, and make sure the retainer agreement explicitly states that all methods used will comply with federal and state law. If an investigator proposes something that sounds like it might be illegal, it probably is, and you are not off the hook just because you didn’t do it yourself.