The key constitutional concept that determines when the Charter protects you from government intrusions.
This page provides legal information, not legal advice. Consult a qualified privacy lawyer or CIPP/C-accredited privacy professional before taking action on access requests, breach response, complaints to a Privacy Commissioner, or Federal Court applications.
Last verified: September 2026
TL;DR
A reasonable expectation of privacy (REP) is the gateway to Charter section 8 protection. Courts look at the subject matter, the claimant's relationship to it, subjective expectations, and objective reasonableness. REP is context-specific and evolves with technology.
The four-part test
The Supreme Court uses a totality-of-the-circumstances test:
Subject matter: what was actually being searched or seized.
Relationship: what connection did the claimant have to the subject matter.
Subjective expectation: did the claimant actually expect privacy.
Objective reasonableness: is that expectation something society is prepared to recognize.
Why REP matters
Without a reasonable expectation of privacy in the thing searched, section 8 does not apply. This means police can obtain or use the information without a warrant.
Shifting with technology
The REP doctrine adapts as technology changes. Early cases dealt with searches of physical spaces; more recent cases have extended protection to digital spaces, metadata, and inferences about behaviour.