Yes. Hiring a private investigator in Ontario is legal, and it is a regulated activity, which is precisely what protects you as a client. Investigators and the agencies that employ them are licensed under the Private Security and Investigative Services Act, 2005, and they operate inside limits set by that Act, by federal privacy law, and by the Criminal Code. Understanding those limits is worth a few minutes before you retain anyone, because the value of an investigation lies almost entirely in whether the work was done lawfully. Evidence gathered outside the lines is not just an ethical problem. It can be inadmissible, and it can expose you.
This page explains what a licensed investigator in Ontario may lawfully do, what no one may do, and where the boundaries fall. It is general information, not legal advice; for a specific situation, consult a lawyer.
What a licensed investigator can lawfully do
A private investigator’s core work is observation and research from lawful vantage points. That includes covert surveillance conducted from public space, documenting what a subject does in view of the public, recording observations with timestamped video and detailed logs, and preserving that record in a form that survives scrutiny later. It includes open-source and social-media research, background and due-diligence checks built on lawfully obtained records, locating people, and interviewing willing witnesses.
The common thread is that a licensed investigator gathers what is already observable or lawfully available, and documents it to a standard that will hold up in a courtroom, a hearing, or a boardroom. The discipline is in the method, not in any special power. An investigator has no more legal authority than any other citizen. What a licensed professional brings is the training to work within the law and the rigour to produce evidence that is defensible.
What nobody may do, investigator or client
Some things are off-limits to everyone, and a licensed investigator will decline them. No one may trespass onto private property to observe or record. No one may intercept a private conversation they are not part of; doing so is an offence under the Criminal Code, as we explain in Recording conversations in Ontario. No one may record in places where a person has a reasonable expectation of privacy, such as inside a home, a bathroom, or a change room. No one may impersonate a police officer or a government official, access another person’s accounts or private data without authority, or place a tracking device on a vehicle that is not theirs.
If an investigator offers to do any of these things, that is the clearest possible signal to walk away. It also tends to destroy the value of the work, because unlawfully obtained evidence is frequently excluded and can rebound on the person who commissioned it.
The licence is the point
The Act makes it an offence to act as a private investigator, or to hold yourself out as one, without the appropriate licence, and to sell investigation services without a business licence. That regulation exists for your protection. A licensed agency has met training and record requirements, carries accountability to the regulator, and can be verified. Before you retain anyone, confirm the licence. We explain exactly how in How to verify your Ontario investigator is licensed.
What this means when you are the one deciding
If you are considering an investigator, you are usually facing something difficult: a suspicion, a safety concern, a dispute that has become too important to leave to guesswork. The reassuring part is that the lawful path and the effective path are the same path. Evidence gathered properly is the evidence that helps you, whether the venue is family court, the Landlord and Tenant Board, an insurer, or your own decision about what to do next. An investigator who cuts corners is not being bold on your behalf. They are handing you a liability.
The right first step is a conversation about what you need to know and whether an investigation can lawfully get it. Some things can be documented. Some cannot, and a professional will tell you so plainly rather than take your retainer and try.
Not legal advice
This page is general information about Ontario law and is not legal advice. For guidance on your specific situation, consult a lawyer.