To stop a private investigator from following you, start by documenting every encounter in detail, then match your response to the conduct: call the police if the investigator trespasses, tampers with your vehicle, or crosses into stalking; send a cease and desist letter through an attorney; file a complaint with your state’s licensing board; and, if the behavior is severe or invasive enough, petition for a protective order or sue for invasion of privacy. What you cannot do is make a PI stop conducting lawful surveillance in public, so the strategy that actually works depends on where their conduct sits relative to the legal line.
Where the Legal Line Sits
An investigator can follow you on public roads, watch you from the sidewalk, and photograph or video you anywhere you don’t have a reasonable expectation of privacy. They can also pull public records and review anything you’ve posted publicly online. None of that is something you can force them to stop.
What they cannot do is where your options live. An investigator commits a crime or a tort if they step onto your private property, place a GPS tracker on your car in a state that prohibits it, intercept your calls or hack your accounts, open your mail, impersonate a police officer, record a private conversation they aren’t part of (and in roughly a dozen all-party-consent states, even one they are part of), or escalate their following into conduct that would make a reasonable person fear for their safety.1Office of the Law Revision Counsel. 18 USC 2511 – Interception and Disclosure of Wire, Oral, or Electronic Communications Prohibited2Office of the Law Revision Counsel. 18 USC 1030 – Fraud and Related Activity in Connection With Computers3Office of the Law Revision Counsel. 18 US Code 1702 – Obstruction of Correspondence4Office of the Law Revision Counsel. 18 USC 912 – Officer or Employee of the United States5National Conference of State Legislatures. Private Use of Location Tracking Devices State Statutes Each of those is a crime, a licensing violation, a basis for a protective order, or a civil claim, and often several at once.
Stalking laws in every state require a pattern of conduct rather than a single incident. That pattern is what separates legal surveillance from criminal harassment, and it’s what a court will look for when you ask for relief.
Document Every Encounter
Every step below depends on what you can prove. Start a written log the day you first notice the surveillance, even if you’re not yet sure whether anything illegal has happened.
For each encounter, record the date, time, and precise location. Note what the investigator was doing, where they were positioned, and how long they stayed. Specifics carry weight that impressions don’t. “Parked across from my driveway on Oak Street for 45 minutes” is useful in a complaint or a courtroom. “I saw them again today” is not.
Capture a physical description of the person and their vehicle: height, build, hair color, clothing, distinguishing features, and the make, model, color, and license plate of the car. Plate numbers are especially valuable because an attorney can use them to identify who the investigator works for, and by extension who’s paying for the surveillance.
When you can do so safely, use your phone. The rule that lets an investigator film you in public lets you film them. Focus on anything that looks like it might be crossing a line: approaching your property boundary, following you into a private garage, tailing so closely it feels aggressive. Save everything with timestamps and back it up somewhere off your device.
When to Call the Police
Police can act the moment an investigator’s conduct becomes criminal. A licensed PI has no immunity from trespass, vehicle tampering, stalking, or impersonation charges.
Call if you feel physically unsafe, if someone has been on your property without permission, if you find an unknown device attached to your vehicle, or if the following has become persistent and aggressive enough to feel threatening. A mechanic or electronics specialist can sweep a car for a tracker if you suspect one. When officers respond, give them your log and any photos or video. Even if they conclude no crime occurred, the incident report becomes part of the paper trail you’ll rely on for a restraining order or a licensing complaint.
Call, too, if you can’t confirm the person following you is actually a licensed investigator. A legitimate PI will generally have credentials on them, though they aren’t required to tell you who hired them. Someone with no license may be operating illegally, or may not be an investigator at all.
Send a Cease and Desist Letter
An attorney can send a formal letter to the investigator or their agency demanding the surveillance stop. The letter doesn’t carry the force of a court order, but it does two useful things. It signals to whoever hired the investigator that continuing carries legal risk, which is often enough to make them pull back. And it creates a written record that the investigator was warned, which strengthens every step that might come after: a lawsuit, a protective order petition, or a licensing complaint.
File a Complaint With the State Licensing Board
Most states license private investigators, and the same agency that issues the license can discipline the holder. Depending on the state, that agency sits within a department of state, a department of public safety, or a specialized bureau. A complaint can lead to fines, suspension, or full revocation of the investigator’s license.
Your documentation log, photos, and any police reports are the substance of the complaint. To find the right agency and form, search your state’s name along with “private investigator license complaint.”
Petition for a Protective Order
If the conduct rises to stalking or harassment, you can ask a court for a protective order. You file a written petition in your local court describing what’s been happening, and a judge reviews the evidence and sets a hearing. Many states waive filing fees for protective orders tied to stalking or harassment. If the judge agrees the conduct meets the legal threshold, the order prohibits the investigator from following or contacting you, and violating it is itself a criminal offense.
Getting an order against a PI is harder than getting one against a stranger. Courts treat investigation as a legitimate profession, so you need to show conduct that clearly exceeds normal surveillance: entering your property, following you into private buildings, appearing at your children’s school, or maintaining a presence so constant it disrupts your daily life.
Sue for Invasion of Privacy
When an investigator’s conduct amounts to intrusion upon seclusion, you may have a civil claim. The tort requires showing that the investigator intentionally intruded on your private affairs in a way a reasonable person would find highly offensive. Using a long-range camera to photograph you inside your home would likely qualify; photographing you in your front yard would not. A successful claim can produce compensatory damages for emotional distress, and punitive damages in the more extreme cases.
If You’re Being Watched Because of a Lawsuit or Insurance Claim
One caution before you act on any of the above. If you’re involved in a workers’ compensation claim, a personal injury lawsuit, or a contested divorce, aggressively trying to shake the investigator can hurt you more than the surveillance itself.
Insurers hire investigators because they suspect a claim overstates an injury. Footage of a claimant sprinting through a parking lot to escape a camera, or acting evasively on video, is exactly what opposing counsel wants. If you’re genuinely injured and living within your medical restrictions, ordinary daily footage doesn’t damage your case; inconsistency between what your records say and what the camera catches does.
Tell your attorney the moment you realize you’re being followed. Your lawyer can assess whether the surveillance is lawful, contact the other side to set limits, and prepare you for surveillance footage showing up as evidence. Often, simply signaling that you know about the surveillance is enough to make the other party back off, because continued aggressive following after that point starts to look like harassment rather than investigation. The steps in this article still apply if the investigator crosses a legal line. They just aren’t a tool for making lawful surveillance go away while a claim is pending.