Larry P. v. Riles https://www.uscourts.gov/sites/default/files/69_1_4_0.pdf Changed it for the entire nation. What you're confusing it with is that the state school system in CA was forced to never give IQ tests to any black children at all because even with the new standard almost all black children tested - and they were being tested by the school because of behavioral problems - were proven to be retarded even after the IQ threshold was lowered. https://archive.is/D3ZQe https://archive.is/qcWk5