
5820-01454 — Canadian Security Intelligence Service
The complainant alleged that the Canadian Security Intelligence Service (CSIS) failed to sufficiently identify redacted portions of records and the basis for withholding information in response to an access request for historical information about Warren Hart. CSIS used negative (white) redactions and cited exemptions only in the response letter, arguing that marking redactions on the records could cause harm. The Information Commissioner found that CSIS did not provide a cogent explanation for how clearly marked redactions and exemptions would reveal protected information. The Commissioner concluded that CSIS failed to meet its obligations regarding severance and the duty to assist. CSIS was recommended to provide a new response with clearly identified redactions and specific exemption provisions, and to cease using negative redactions and citing exemptions only in response letters. CSIS agreed to implement these recommendations.
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