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In this text, we demonstrate that the most widely used intelligence quotient (IQ) tests in the world (such as the Weschler scale) are not culturally biased in favor or against particular ethnic groups. The article is divided into four parts. We will first analyze the concept of bias and the three main errors associated with our understanding of it. The next two parts are devoted to biases related to construct validity and those related to the test-taking context. In the final part of this article, we present some of the legal challenges and developments that have taken place in the United States with a view to developing culture-fair intelligence tests.