Pierre Berton, left, signs a copy of his new book Marching As To War for fellow author and friend Ted Barris in Toronto, September 25, 2001. Is Berton a Canadian? That’s what a branch of the federal heritage department is asking -- a request the noted author calls "hilarious." But unless Berton shows some I-D, an Edmonton film company doing a documentary about him won’t get the tax credit it expects. The demand is from CAVCO -- which stands for the Canadian Audio Visual Certificate Office. (CPPHOTO ARCHIVE/Aaron Harris)