Hiring an Infidelity Private Investigator in New York

An infidelity private investigator is a licensed investigator who finds out, legally and quietly, whether a spouse or partner is cheating. In New York that mostly means surveillance in public places, dated photos and video, and a written report your attorney can use. A PI cannot tap a phone, read texts or get into an account. At NYIA, surveillance is $240 an hour with one investigator, and the first talk is free.

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What’s Inside

14 sections

This guide is for the person still deciding. It covers what the law lets an investigator do in New York, what it does not, how the process runs, how the proof is used in a divorce or custody case, what moves the cost, and how to pick the right person. If you already know you want help, our infidelity private investigator page has the full service, rates and FAQ.

What an Infidelity Private Investigator Actually Does

Most people picture a trench coat and a long lens. The real job is quieter and more careful than that. An infidelity investigator learns your partner's routine, picks the windows most likely to show something, and then watches from places anyone is allowed to be.

That can mean following a car across boroughs, sitting on a restaurant from across the street, or waiting outside an office building at the hour your spouse says they are working late. Every movement goes into a time stamped log. Photos and video are taken only of what can be seen from a public spot.

The investigator may also pull public records. That can include property filings, business records and court cases. A background check on the other person is common too, because many clients want to know who their partner is really spending time with. At NYIA a background check is $400, or free when you book surveillance.

At the end you get a report. It says where your partner went, when, and with whom, backed by photos and video. It is written so a divorce attorney can read it and a judge can trust it.

Signs People Notice Before They Call

No single sign proves an affair. People change for lots of reasons, like stress at work, money worries or health. But most clients call after a pattern builds up over weeks or months. These are the ones we hear about most.

• A phone that is suddenly private. A new passcode, a phone kept face down, or calls taken in another room.
• New late nights. Work runs late more often, and the story does not quite fit the job.
• Odd charges. Restaurants, hotels, gifts or ride shares you do not recognize, or cash that goes missing.
• A shift in care about looks. New clothes, a new gym habit or a new cologne with no clear reason.
• Distance at home. Less talk, less touch, and quick anger when you ask simple questions.
• Trips that change shape. A weekend away that grows a day, or plans that shift at the last minute.

If a few of these line up, write them down with dates. That timeline is the most useful thing you can bring to an investigator. We explain how to keep one safely in what to do if you suspect your spouse is cheating.

What an Infidelity Investigator Can Legally Do in New York

Private investigators in New York must hold a license from the Department of State under Article 7 of the General Business Law. The license does not give special powers. It means the investigator is allowed to do this work for pay, and it holds them to the same laws as everyone else. Inside those laws, a licensed investigator can do a lot.

• Follow a person on foot or by car in public places.
• Photograph and film what anyone could see from a public spot, like a street, a lobby open to the public, or a parking lot.
• Search public records such as property, business, court and marriage filings.
• Run background checks for a lawful purpose.
• Talk to neighbors, coworkers or others who agree to talk.
• Record a conversation the investigator is part of, since New York only needs one party to consent.
• Collect what someone posts publicly online.
• Write a report and testify in court about what they saw and how they kept the proof.

Our license numbers are #11000178595 (New York) and #11000061564 (Haverstraw), and you can check them yourself on the state's license search.

What No Investigator Can Do for You

This part matters as much as the list above. None of these become legal because a client paid for them.

• Tap a phone or record private talks. Recording a call or conversation when no one in it agreed is eavesdropping, a class E felony in New York.
• Hide a camera where people expect privacy. That is unlawful surveillance, also a crime.
• Get into a phone, email or social account. Logging in without permission can break state and federal computer laws.
• Trick a bank or phone company. Posing as the customer to get records is illegal. Those records come out through a subpoena in a real case, through your lawyer.
• Enter a home, hotel room or office. Going in without permission is trespass.
• Pose as a police officer. That is criminal impersonation.
• Track a car with no right to it. Whether a GPS tracker is allowed depends on who owns and drives the car. It is never placed on a car the client has no right to.

If someone offers any of these on the first call, hang up. They are offering you a crime, and proof gathered that way can be kept out of court. It can also make you the one who has to explain things to a judge. You can read more in how private investigators legally collect evidence in New York.

Things Not to Do on Your Own

When you are hurt and suspicious, it is natural to want to dig in yourself. A few moves feel smart and often backfire.

• Do not install a spy app on a phone that is not yours. It can be a crime, and it can hand your spouse a strong argument against you.
• Do not log in to their email or social media, even if you know the password. Knowing a password is not the same as having permission.
• Do not follow them yourself. You will likely be seen. That ends any chance of catching the truth, and it can turn into a harassment claim.
• Do not confront them yet. A warned partner gets careful. The pattern you noticed can stop for weeks.
• Do not move money or empty accounts. Talk to a divorce lawyer first. Sudden moves can hurt you in court.

What you can do safely is keep a private, dated note of what you see, and keep copies of shared bills and statements you already have a right to.

How Hiring an Infidelity Private Investigator Works

Every agency runs a little differently. This is how a case runs with us, from the first call to the final report.

1. A free, private talk. Call, text or visit our Fifth Avenue office. Tell us what you have noticed. We tell you honestly whether surveillance can answer your question.
2. A plan around their routine. We pick the days and hours most likely to show something, like a late night at the office, a gym class or a weekend trip.
3. A written estimate. You see the cost before any work starts, with no obligation.
4. Surveillance. Unmarked vehicles, and investigators who never make contact with your partner.
5. Your report. Time stamped notes, photos and video, sent to you securely.
6. Court, if you need it. The investigator can testify to what they saw and how the proof was kept.

Timing matters more than hours. A case built around one known dinner or trip often answers the question faster, and for less money, than a week of open ended watching. If the moment is tonight, ask about last minute surveillance.

How Evidence Is Used in a New York Divorce

New York has allowed no fault divorce since 2010. A spouse can end the marriage by stating under oath that it has broken down for at least six months. So you do not need to prove an affair to get divorced. That leads many people to ask why proof matters at all. It often does, in a few specific ways.

Adultery as a Ground

Adultery is still listed as a ground for divorce in Domestic Relations Law 170. It is used far less now. Courts want proof that goes beyond one spouse's word, which is one reason an investigator's report and testimony carry weight. Adultery itself is no longer a crime in New York. The state repealed that old law in 2024.

Money Spent on the Affair

New York divides marital property in a fair way, which is not always an equal one. Under Domestic Relations Law 236, a court can look at whether one spouse wasted marital money. Hotels, trips, gifts or rent paid for a new partner can fall into that. Showing where the money went can matter. If you think assets are being hidden, see how investigators find hidden assets in a divorce.

What Fault Does Not Usually Change

An ordinary affair does not usually change how property is split. New York courts save that for conduct that is truly extreme. It is worth hearing this from your lawyer early, so you know what the proof is for.

Spousal Support and Living Together

Domestic Relations Law 248 lets a court change or end spousal support after a divorce when the person receiving it lives with someone and holds themselves out as that person's spouse. That is a hard test to meet, and it takes a clear record over time. Our post on cohabitation surveillance in alimony disputes explains how that kind of case is built.

Settlement Leverage

Most divorces settle. Clear, dated proof changes how both sides talk about the case. It can shorten a fight and cut legal bills, even if nothing is ever shown to a judge.

This is general information, not legal advice. Your divorce lawyer is the right person to say how proof fits your case. We work with attorneys all the time, and our work for attorneys page explains how.

Does Infidelity Affect Custody in New York?

Not by itself. A New York judge decides custody based on the best interests of the child. An affair on its own says little about parenting. But conduct tied to the affair can matter. Examples include leaving a child alone to meet someone, bringing a new partner with a risky past around the child, or drinking or drug use during parenting time. When that is the concern, the case is really a custody case, and the approach is different. Read what a PI can legally do in a child custody case.

What Drives the Cost of an Infidelity Investigation

Infidelity work is almost all surveillance, so it is billed by the hour, with a daily minimum. A real surveillance job cannot be done in fifteen minutes. These are our published rates.

What you book	Price
Surveillance, one investigator	$240 an hour
Surveillance, two investigators	$280 an hour
Vehicle	$100 a day
Daily minimum	5 hours
A standard day, one or two investigators	$1,300 or $1,500
Marital records search	$600 flat
Background check	$400, free with surveillance

What moves the total up or down:

• How many days it takes. A known date is cheaper to cover than a vague worry.
• One investigator or two. A partner who drives, takes the subway and walks in the same evening may need a team.
• Distance. A subject who crosses boroughs or heads to Westchester or Long Island takes more time.
• What you need at the end. A short report, full video, or an investigator ready to testify.
• How fast you need us. Same day starts take more juggling.

Every case is quoted on its own, and you get the estimate in writing first. For a wider look at pricing across services, see what a private investigator costs in New York.

How to Choose an Infidelity Investigator

You are handing a stranger one of the most private parts of your life. Take ten minutes to check them first.

• Check the license. Ask for the number in writing, then look it up on the Department of State license search. Make sure the name matches the company taking your money.
• Ask who does the field work. Some firms sell the case and pass it to someone else. You should know who is out there.
• Ask about court. Will the investigator testify if needed? Have they done it before?
• Ask to see how a report looks. A good firm can describe what you will get, with names removed.
• Get the price in writing. Hourly rate, minimums, vehicle charges and anything extra.
• Listen for the red flags. Phone records, bank balances, getting into a phone or "a friend at the department" all mean walk away.
• Judge the first call. A good investigator asks more than they promise, and will tell you if surveillance is not the right tool.

We wrote a longer checklist in how to hire a private investigator in New York. And our confidentiality standards explain how we protect your name and your file.

What Happens After You Get the Report

Some reports show nothing unusual. That is an answer too, and for many people it is the one they hoped for. You get the same dated report either way.

If the report confirms what you feared, slow down before you act. Take it to a divorce lawyer before you show it to your partner. Your lawyer can tell you how and when it helps most. Lean on people you trust, and look after your health. The truth is hard, but it lets you plan instead of guess.

Infidelity Private Investigator Questions

Talk It Through With David

You do not have to decide anything on the first call. Tell us what you have seen, and we will tell you honestly whether an investigation makes sense, what it would cost, and what it cannot do. Call David at (646) 461-4650 any hour, or text (646) 465-2006. You can also contact us online or read more about our infidelity investigations in New York City.

Official Sources You Can Check Yourself

We would rather you check this than take our word for it. These are the primary sources behind this guide.

• General Business Law 70. The state license every private investigator needs.
• Department of State license search. Look up any New York investigator. Ours are #11000178595 (New York) and #11000061564 (Haverstraw).
• Penal Law 250.05, eavesdropping. Why no licensed investigator will tap a phone.
• Domestic Relations Law 170. The grounds for divorce, including no fault and adultery.
• Domestic Relations Law 236. How marital property and support are decided.
• Domestic Relations Law 248. When support can change because a former spouse lives with someone new.