http://www.cic.gc.ca/english/skilled/qual-3.html

Signature
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Andrew Miller
Immigration Consultant
Vancouver, British Columbia
email: AndrewMillerREMOVE@REMOVEcanada.com
(delete REMOVE from the above address before sending email)
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> If someone is a native speaker of either French or English, what kind
> of proof is necessary for the language proficiency?
> Thanks