This article was originally published in the National Post. By Laurie Pawlitza   The more complex our world has become, the more likely it is that litigation will involve expert evidence. Many family law cases require the expert testimony of psychologists or social workers who make recommendations on what is in a child’s best interests. Other experts appearing frequently in the family courts include real estate appraisers and chartered business valuators, who testify about the value of shares in private companies and income for support purposes. Some years ago, judges began to express concern about the independence of the experts appearing…