Is It Legal to Hire a Private Investigator? A Complete Guide
The Short Answer: Yes, It Is Completely Legal
Hiring a licensed private investigator is legal in all 50 states and has been for well over a century. Private investigation is a regulated profession with state licensing boards, professional standards, and legal frameworks that govern how investigators operate.
The question people are really asking when they search "is it legal to hire a private investigator" is usually one of these: Will I get in trouble? What are the limits of what they can do? Will the evidence they find hold up in court? Can my spouse or the person being investigated find out?
This guide answers all of those questions based on our years of conducting investigations within the legal framework that governs our profession.
What Private Investigators Can Legally Do
Licensed private investigators have the same rights as any private citizen, plus the training, tools, and expertise to exercise those rights effectively. Here is what falls within legal boundaries:
Surveillance in Public Places
An investigator can observe and document anyone's activities in any public space. This includes streets, sidewalks, parks, parking lots, shopping centers, restaurants, and any other location that is open to the public. There is no reasonable expectation of privacy in public places, which means photographing and video-recording someone's activities in these locations is completely legal.
Public Records Research
Investigators access a wide range of public records including court records, property records, business filings, vehicle registrations, marriage and divorce records, voter registrations, and professional licensing records. These records are, by definition, available to the public. Investigators know how to find them efficiently across multiple jurisdictions and databases.
Background Investigations
A licensed PI can conduct thorough background checks that verify identity, criminal history, education, employment, and other biographical information through legal research methods and direct verification with institutions.
Witness Interviews
Investigators can approach and interview anyone who is willing to speak with them. They cannot compel someone to talk, but they can ask questions. Many people are willing to share information when approached professionally by a licensed investigator. This is a routine part of legal, insurance, and domestic investigations.
Social Media Monitoring
Any publicly visible social media content can be viewed, documented, and used as evidence. Investigators use professional tools to capture and preserve social media evidence in ways that meet court admissibility standards.
Skip Tracing and People Location
Investigators use databases, public records, and field investigation to locate missing or hard-to-find individuals. This is legal and widely used for service of process, witness location, debt recovery, and reconnecting with lost family members.
What Private Investigators Cannot Legally Do
The legal limits on private investigators exist to protect everyone's privacy and civil rights. Understanding these limits is important because evidence obtained through illegal methods is inadmissible in court and can result in criminal charges against both the investigator and the client who directed the illegal activity.
Trespassing
Investigators cannot enter private property without permission. They cannot break into homes, offices, storage units, vehicles, or any other private space. All observations must be made from public locations or locations where the investigator has legal authorization to be.
Wiretapping and Electronic Interception
Intercepting phone calls, emails, text messages, or any other electronic communications without proper legal authorization is a federal crime under the Electronic Communications Privacy Act. Investigators do not tap phones, intercept emails, or use any form of electronic eavesdropping.
Hacking or Unauthorized Computer Access
Accessing someone's computer, phone, email account, social media account, or any other digital system without authorization is a federal crime under the Computer Fraud and Abuse Act. This applies even if the investigator is hired by a spouse or employer who believes they have a right to the information.
Impersonating Law Enforcement
Private investigators are not police officers and cannot represent themselves as law enforcement. They cannot use badges, uniforms, or language designed to make someone believe they are dealing with a government authority. This includes representing themselves as federal agents, state police, or any other official capacity.
GPS Tracking (Varies by State)
The legality of GPS tracking by private investigators varies significantly by state. Some states allow vehicle owners to track their own vehicles. Others require court orders for any electronic tracking. Our investigators comply with the specific laws of each state where they operate.
Your Liability as a Client
As the person hiring a PI, you have certain responsibilities and potential liabilities:
- You cannot direct illegal activity. If you instruct an investigator to break into someone's home, hack their email, or tap their phone, you share criminal liability for those actions. A reputable investigator will refuse these requests
- You can specify objectives legally. You can tell an investigator what you want to learn (for example, "I want to know if my spouse is meeting someone else" or "I need to find hidden assets"), and the investigator decides which legal methods to use
- You are protected by confidentiality. The relationship between client and investigator is professional and confidential. Your investigator will not disclose your identity or the details of your case without your authorization or a court order
- Evidence may be disclosed in court. If investigation results are used in legal proceedings, the evidence and potentially the investigator's testimony become part of the court record. Discuss this possibility with your attorney before beginning an investigation
State Laws That Affect How Investigations Are Conducted
Several state-level laws directly impact investigation methods:
Recording Consent Laws
States are divided into "one-party consent" and "two-party consent" (also called "all-party consent") jurisdictions for audio recording. In one-party states, a participant in a conversation can record it without the other party's knowledge. In two-party states (including California, Florida, and Illinois), all parties must consent.
GPS and Electronic Tracking
State laws on GPS tracking range from permissive to restrictive. Some states have no specific statute, while others like California have explicit laws (Penal Code Section 637.7) restricting electronic tracking without consent.
Drone Surveillance
The use of drones for surveillance is regulated at both the federal (FAA) and state levels. Most states restrict drone surveillance over private property, and some prohibit it entirely for private investigation purposes.
Common Legal Scenarios
Hiring a PI During Divorce
Completely legal and extremely common. Infidelity investigations, asset searches, and custody investigations are among the most frequently requested PI services. Your spouse does not need to know about the investigation, and evidence gathered legally is admissible in family court.
Investigating a Business Partner
Legal and often recommended before entering business agreements. Due diligence investigations and background checks protect your financial interests by verifying the representations made by potential partners.
Investigating an Employee
Legal when conducted properly. Employers have the right to investigate suspected misconduct, theft, policy violations, and workers compensation fraud. However, workplace investigations must comply with employment law and, in some cases, union agreements.
How to Choose a Legal, Ethical Investigator
To protect yourself and ensure your investigation stays within legal boundaries:
- Verify licensing. Every legitimate PI holds a state-issued license. Verify it through the state's regulatory agency before hiring anyone
- Ask about methods. A reputable investigator will explain what methods they will use and confirm that everything is legal. Be wary of anyone who promises to "get you anything" without discussing legal boundaries
- Get a written agreement. A professional engagement letter protects both parties by specifying the scope of work, methods, costs, and confidentiality terms
- Check insurance. Professional liability insurance protects you if something goes wrong during the investigation
- Trust your judgment. If an investigator seems willing to cut corners, bend rules, or operate outside legal boundaries, find someone else. The short-term appeal of illegal evidence is not worth the long-term legal consequences
For a complete guide to the hiring process, see our resource on how to hire a private investigator. For pricing information, visit our cost guide.