CanadaCan police use thermal imaging to look inside my home without a warrant?
No, police generally cannot use thermal imaging to look inside your home without a warrant in Canada. The Supreme Court ruled in R. v. Tessling that while FLIR scanning of a home’s exterior is not a 'search' under section 8 of the Charter, it still engages privacy interests — but warrantless use was upheld on the facts because no intimate details were revealed.
What the Law Says
The Canadian Charter of Rights and Freedoms protects individuals from unreasonable search and seizure. Section 8 is the key provision governing privacy expectations in relation to state surveillance, including technological methods like thermal imaging.
Section 8 of the Charter states: 'Everyone has the right to be secure against unreasonable search or seizure.' This right applies to both physical intrusions and certain forms of electronic surveillance.
However, whether a particular technique constitutes a 'search' depends on whether the person has a 'reasonable expectation of privacy' in the information obtained — assessed using a 'totality of the circumstances' test.
The law does not prohibit all warrantless surveillance — only those that violate reasonable privacy expectations. Thermal imaging that captures only heat patterns from a home’s exterior (not interior details) has been found, in some cases, not to breach section 8.
Statutory TextEveryone has the right to be secure against unreasonable search or seizure.
— Canadian Charter of Rights and Freedoms, s. 8
What Courts Have Said
The Supreme Court of Canada addressed thermal imaging in R. v. Tessling, setting the leading precedent on whether FLIR technology triggers constitutional protection under section 8.
The Court held that warrantless FLIR scanning of a home’s exterior did not constitute an unreasonable search under section 8, because the heat-loss data revealed no 'intimate details' of life inside and was analogous to observations any member of the public could make from afar — though the decision emphasized that privacy analysis must consider the totality of circumstances.
What to Do
If you believe police used thermal imaging to gather evidence against you without justification, raise a section 8 Charter challenge in court.
Ask your lawyer to argue whether the scan revealed intimate details or crossed into a reasonable expectation of privacy.
Note that Tessling does not give police blanket authority — newer technologies or more intrusive uses may be treated differently by courts today.
Document the circumstances: timing, duration, and whether other surveillance methods were used alongside thermal imaging.
Sources
Not legal advice. This article is general information based on publicly available sources, written for educational purposes. Laws change and individual situations vary. Consult a licensed attorney in your jurisdiction before acting on anything you read here. Last reviewed: 2026-06-08.