People hire a private investigator in a Singapore divorce for one reason nine times out of ten: to gather evidence that their spouse is having an affair. It is legal to do so, provided you engage a licensed agency and the investigator stays within the law. The harder questions are whether the evidence will actually help your case, and whether you need it at all.
This article covers what a licensed investigator can lawfully do, what crosses into criminal territory, and why a large proportion of the people who ask about surveillance would be better served by a different approach entirely.
Private investigators in Singapore must be licensed
Private investigation is a regulated activity under the Private Security Industry Act. Both the agency and the individual investigators working for it must hold the appropriate licence, and carrying on private investigation work without one is an offence.
Before you engage anyone:
- Ask for the agency’s licence details and the licence held by the investigator who will do the work.
- Check the details against the regulator’s published records rather than taking a photograph of a certificate at face value.
- Get the engagement, the fee basis and the scope in writing.
- Treat any offer to “get into” a phone, an email account or a bank record as a red flag and walk away.
An unlicensed operator is not simply a compliance problem. Their evidence is easier to attack, they have no regulatory accountability, and if their methods were unlawful you may be the one exposed.
What a private investigator can lawfully do
The lawful territory is narrower than television suggests, and it is essentially this: observing and recording what an ordinary member of the public could observe from a place they are entitled to be.
- Observation in public places: following a person along a street, sitting in a public area, noting who they meet and where they go.
- Photographing what is visible in public: a couple entering or leaving a building, a car outside an address, people together at a restaurant.
- Recording timings and movements in a dated, contemporaneous log that can support an affidavit.
- Open-source checks: publicly available records and information the subject has themselves made public.
Good surveillance evidence is repetitive and boring: the same two people, at the same address, on multiple dates, with times and photographs that hang together. That pattern is what allows a court to draw an inference. One evening’s photographs prove very little.
What is unlawful, and what it costs you
The line is crossed the moment the investigator has to enter somewhere, access something, or obtain data they have no right to. The main prohibitions to understand:
- Trespass: entering private property, including a condominium’s private areas or a home, without permission.
- Unauthorised access to a computer or phone: logging into an email, messaging or cloud account, or unlocking a device, without authorisation is an offence under the Computer Misuse Act. So is procuring someone else to do it.
- Intercepting communications: installing spyware, keyloggers or interception software to capture messages or calls.
- Tracking devices: fitting a tracker to a vehicle you do not own or control.
- Unlawfully obtained personal data: obtaining someone’s phone records, bank statements, address or employment details from a person who had no right to disclose them can engage the Personal Data Protection Act, including offences relating to unauthorised disclosure of personal data by individuals.
Two consequences follow, and the second is the serious one. First, evidence obtained unlawfully may be excluded, or given little weight, and it hands the other side an easy attack on your credibility. Second, and worse, you can face criminal liability yourself as the person who commissioned it. Saying the investigator did it on their own initiative is not much of an answer when you paid for the result.
You probably do not need to prove adultery
This is the part that saves people the most money. Singapore has one ground for divorce, irretrievable breakdown, proved by one of six facts. Adultery is only one of them, and it is among the harder and more expensive to run.
Two alternatives cover most situations:
Unreasonable behaviour
You have to show that your spouse behaved in such a way that you cannot reasonably be expected to live with them. That is a broad, fact-sensitive test, and it does not require surveillance. Persistent emotional withdrawal, financial irresponsibility, verbal abuse, or an inappropriate relationship falling short of provable adultery can all be pleaded. See how unreasonable behaviour is pleaded and proved and the full range of facts you can rely on for divorce in Singapore.
Divorce by mutual agreement
Since 1 July 2024, spouses who both accept the marriage has irretrievably broken down can rely on divorce by mutual agreement, without either of them having to allege fault. Where the other side is willing, this removes the need to prove anything about their conduct at all.
If your case is genuinely about adultery and how it is proved (for instance because your spouse denies the relationship and will not consent to any other route) investigation may be justified. Understand first that adultery on its own has limited effect on how assets are divided or how the children are cared for. It affects the paperwork more than the outcome.
What it costs, and what you get
Agencies typically quote either an hourly rate with a minimum engagement, or a package covering a set number of surveillance days, plus expenses. A meaningful surveillance exercise runs over several sessions, because a single sighting proves little, and costs can climb into the thousands with no guarantee that anything usable emerges. Ask specifically what happens, and what you pay, if the surveillance produces nothing.
Set that against the rest of your budget. Surveillance money is money not spent on the ancillary matters, which is where the outcomes that affect your life for the next decade are actually decided. It is worth reading how divorce legal fees are structured and the practical ways of keeping divorce costs down before committing.
The emotional cost
People who commission surveillance often describe the same experience: the report confirms what they already suspected, and it does not bring the relief they expected. Reading a timed log of your spouse’s evenings, and looking at the photographs, tends to deepen the injury rather than close it.
Ask yourself honestly what you want the evidence for. If the answer is that you need it to prove a specific fact your case genuinely depends on, engage a licensed agency and give them a narrow, defined brief. If the answer is that you want confirmation, or you want your spouse confronted with proof, the money will usually buy you pain rather than progress, and none of it changes what a court will do with your matter.
Practical steps if you decide to proceed
- Speak to a lawyer first about whether the evidence would actually make a difference to your case.
- Engage only a licensed agency, and verify the licence independently.
- Put the scope in writing, and expressly instruct that no unlawful method is to be used.
- Ask for a dated report with a contemporaneous log, so it can support an affidavit.
- Do not conduct your own surveillance alongside it. Following or waiting outside a person’s home can itself amount to harassment.
