With certain visas issued by our colleagues at Immigration, Refugees and Citizenship Canada, the foreign visa officer takes a biometric measurement, which is to say fingerprints, so that it is possible to confirm that a person arriving at a Canadian point of entry is really the person to whom the visa has been issued. We then confirm the authenticity of the fingerprints. There is a validation system to make sure that it really is the right person.
On September 27th, 2017. See this statement in context.