Canada’s intelligence service says it began looking into former federal scientist Dennis Lu after Natural Resources Canada brought forward concerns, countering any suggestion that the agency initiated the matter on its own.

According to the agency, the approach happened more than 20 years ago. In a rare step, CSIS has disclosed one of its documents in court as it tries to clarify how its involvement began and correct the public record.

The development puts renewed attention on the relationship between federal departments and national security agencies when concerns are raised about employees in sensitive roles. It also highlights how unusual it is for intelligence-related records to be discussed publicly in legal proceedings.

While the full court context is not detailed in the available report, the central point from CSIS is clear: the initial warning came from Natural Resources Canada, and that tip-off prompted the agency’s review of Lu.