What a Private Investigator Can and Cannot Legally Do

Published August 3, 2026

If you have ever considered hiring a private investigator, one of the first questions you probably have is: what are they actually allowed to do? Hollywood tends to portray PIs as rule-bending operatives who tap phones, break into buildings, and access any record they choose. The reality is far more grounded—and far more law-abiding. A licensed private investigator operates within a defined legal framework, and understanding that framework helps you set realistic expectations before you pick up the phone.

The Legal Foundation: Licensing and Accountability

Private investigators are regulated at the state level, which means the rules governing their work vary depending on where they operate. Most states require investigators to hold a valid license, pass a background check, and meet experience or education requirements. In Texas, for example, the Department of Public Safety oversees PI licensing, and working without a license is a criminal offense.

Before hiring anyone, verify their license through your state's official licensing board. You can start a general government services search at USA.gov, which can point you toward your state's regulatory agencies. Asking to see a license number—and confirming it is active—is one of the most important steps you can take.

What a Private Investigator Can Legally Do

Licensed investigators have a meaningful set of tools available to them when they work within the law. Here is what they are generally permitted to do:

• Conduct surveillance in public spaces. A PI can observe and photograph or video-record people in locations where there is no reasonable expectation of privacy—public streets, parking lots, parks, and similar areas.
• Perform background research using public records. Court records, property records, business filings, and other documents that are publicly available can be reviewed and compiled legally.
• Interview willing witnesses. Investigators can speak with people who agree to talk. They cannot compel anyone to speak with them the way law enforcement can with a subpoena.
• Locate people using legal methods. Skip tracing—finding someone's current address or whereabouts—is a common PI service when done through lawful means such as public records and database searches.
• Serve legal documents. In many states, licensed PIs are authorized to serve subpoenas and other legal paperwork.
• Investigate insurance claims and fraud. Many investigators work with attorneys or insurers to document potentially fraudulent activity using observation and public information.
• Verify information provided on applications or in legal matters. This includes employment history, credentials, and other facts that can be confirmed through legitimate channels.

If a background check is part of the service—especially for employment purposes—there are important federal rules in play. The Federal Trade Commission publishes guidance on how background screening must comply with the Fair Credit Reporting Act (FCRA), which governs how consumer information is collected and used.

What a Private Investigator Cannot Legally Do

This is where the popular image of the PI diverges sharply from reality. There are clear legal lines that no licensed investigator should cross—and if someone offers to cross them for you, that is a serious red flag.

• Trespass on private property. Entering someone's home, yard, or other private space without permission is trespassing, full stop. A PI has no special authority to enter private property that an ordinary citizen does not have.
• Wiretap or record phone calls without consent. Federal wiretapping law and state wiretapping or eavesdropping statutes make it illegal to intercept private communications without proper consent. Some states require all parties to a conversation to consent to recording; others require only one. An investigator must know and follow the applicable law.
• Hack into computers, email, or social media accounts. Accessing someone's private digital accounts without authorization violates federal computer fraud laws, regardless of who is doing it.
• Impersonate a law enforcement officer. A PI cannot claim to be a police officer, federal agent, or any other government official. This is a crime in every jurisdiction.
• Access protected records without authorization. Financial records, medical records, and certain government databases are protected by law. A PI cannot obtain these records through deception or unauthorized access.
• Use GPS tracking where prohibited. Placing a GPS tracker on a vehicle you do not own is illegal in most circumstances. The laws around GPS surveillance vary by state, so an investigator must understand those boundaries clearly before using any tracking device.
• Engage in harassment or stalking. An investigator's conduct must not rise to the level of harassment, intimidation, or stalking under any applicable statute.
• Impersonate another private individual. Using a false identity to deceive a subject into revealing information—sometimes called pretexting—is heavily restricted and, in many contexts, illegal under federal and state law.

For a deeper look at the legal framework around consumer information and privacy, Nolo's legal information library offers plain-language explanations of privacy law and related topics that are useful for anyone trying to understand these boundaries.

Why These Boundaries Matter to You as a Client

Hiring an investigator who operates outside the law does not just put them at risk—it can put you at risk as well. Evidence obtained illegally is often inadmissible in court and can actually harm your case. In some circumstances, knowingly directing an investigator to break the law could expose you to legal liability.

If you are hiring a PI because a situation has potential legal consequences—a custody dispute, litigation, a fraud claim—consult a licensed attorney before and during the process. An attorney can help ensure that anything an investigator finds is gathered and preserved in a way that will actually be useful to you. You can find general guidance on working with legal professionals at the Legal Information Institute at Cornell Law School.

Questions to Ask Before You Hire

Use this checklist when speaking with any investigator:

1. Are you licensed in this state, and can I verify your license number?
2. What specific methods will you use to gather the information I need?
3. Are there any aspects of my request that raise legal concerns for you?
4. How do you handle information about the legal limits of surveillance or recording in this state?
5. Will the information you gather be usable in court if needed?
6. Do you carry professional liability insurance?
7. What is your fee structure, and what does your contract include?

A reputable investigator will welcome these questions. If someone is evasive or dismissive when you ask about legal boundaries, treat that as a warning sign.

Setting Realistic Expectations

A licensed private investigator is a skilled professional who uses legal methods to gather factual information. They can observe, document, research, and report—but they cannot guarantee a specific outcome, and they cannot use illegal means to get you the answer you are hoping for. The value they provide is real, documented information obtained in a way that protects both you and them.

Understanding what investigators can and cannot do helps you ask better questions, hire more wisely, and use the information they provide more effectively.

If you are ready to explore your options, you can use this site to request a connection with a licensed private investigator in your area—completely free, with no obligation to hire.