Surveillance investigations: how they work and what to expect
Surveillance is one of the most requested investigative services and one of the most misunderstood. It is not what television shows. Done properly, it is patient, lawful observation aimed at a specific question, documented carefully so the client and, where relevant, their attorney can rely on what was seen. This guide explains how surveillance investigations generally work, what to share, what reports typically contain, and the limits the work stays within.
This article is general information, not legal advice.
What a surveillance investigation is
Surveillance means observing and documenting a person's activities in places where observation is lawful, usually public places, and recording what is seen with notes, photographs, or video. It is used to answer a defined question. Examples include whether someone claiming an injury is doing activities inconsistent with the claim, whether an employee on leave is working elsewhere, whether a parent is following court-ordered conditions during parenting time, or who a person meets on a given evening.
A clear question makes for better surveillance. "Is my business partner meeting with a competitor on weekday afternoons?" can be planned for. "Find out what he is up to" usually cannot.
How it generally works
Surveillance usually begins with research: confirming the subject's identity, addresses, vehicles, and likely routines. Then comes planning. That means choosing the days and times most likely to answer the question, where to be positioned, and how to follow a vehicle safely if needed. The size of the team and the length of each session depend on the setting and the question.
People change their plans, so experienced investigators schedule sessions around the days and times most likely to answer the question. Discretion comes first. If the subject appears to notice, investigators generally break off rather than risk exposure or confrontation, even if that means ending a session early. No investigator can promise that a particular day will show a particular activity.
What clients should share
- The subject's full name, a recent photo, and a physical description
- Vehicles, with make, model, color, and plate if known
- Home and work addresses, and places the person often goes
- Known schedules and the dates or times that matter most
- The specific question you need answered, and why
- Anything that affects safety, such as weapons, a history of violence, or a subject who is alert to being watched
- What you already know, and how you know it
- Whether an attorney, insurer, or court matter is involved
What reports typically contain
Reports vary by engagement and by what the client needs, but surveillance reports generally include a time-stamped log of observations, descriptions of the subject's activities and locations, photographs or video where they were lawfully obtained, and notes on periods when the subject was not observed. A good report records facts rather than conclusions. It describes what was seen and leaves the interpretation to the client and their counsel. Whether any of it is used or accepted in a legal setting is not something an investigator decides.
Lawful limits
Professional surveillance stays within the law, and those limits protect the client as well as the subject. Investigators do not trespass, look into homes or other places where people reasonably expect privacy, record private conversations without the consent the law requires, or contact or harass the subject. Placing a tracking device on a vehicle raises legal issues that vary by state and circumstance, and it is not something to do on your own. Investigators also follow traffic laws while following a vehicle.
Clients should not run their own surveillance or follow the person themselves. It can create safety risks, legal exposure, and a confrontation that ends any chance of getting a clear answer.
Example (hypothetical)
A company's attorney asks for surveillance of an employee who is on paid medical leave and is rumored to be working for a competitor. The investigator confirms the employee's address and vehicle, then observes on three weekday mornings. On two of the three mornings, the employee drives to a competitor's warehouse and stays for several hours. The report logs the times, describes the activity, and includes photographs taken from a public street. The attorney decides how to proceed.
Surveillance often follows background research; see background checks: what investigators do. For personal and family matters, see domestic investigations: what to know.
Talk it through
TB Defense is based in Chicago and led by a Chicago Police officer with 20 years of service, with surveillance teams that work locally, nationally, and internationally. We plan every assignment around the question, the subject, and what you already know. Read about our private investigations, including surveillance, or Get protected and describe what you need answered.
Common questions
What does a surveillance investigation involve?
Lawful observation and documentation of a person's activities, usually in public places, recorded with notes, photographs, or video to answer a specific question. It generally begins with research and planning around the days and times most likely to answer that question.
What should I tell the investigator before surveillance starts?
The subject's name, photo, description, vehicles, addresses, usual places and schedules, the specific question, the dates that matter, anything that affects safety, what you already know, and whether an attorney or court matter is involved.
What is in a surveillance report?
Reports vary by engagement but generally include a time-stamped log of observations, descriptions of activities and locations, lawfully obtained photos or video, and notes on when the subject was not observed. Good reports record facts, not conclusions.
Can I follow the person myself to save money?
It is not a good idea. Following someone yourself can create safety risks and legal exposure, and a confrontation can end any chance of getting a clear answer.