Any folding knife a CBSA agent can flick open after minimal manipulation may be seized. CBSA has their own interpretation of the Criminal Code and makes up their own rules about prohibited knives. Many knives that are legal to own in Canada according to police and courts are now illegal to import. The Canadian government recently dismissed an e-petition calling for this situation to be fixed. I no longer import knives or travel out of the country with anything I wouldn’t be ok losing at the border.