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The most important constitutional challenge that needs to occur is the one that challenges the educational standards and standardized testing regimes that reward some students, not by race, gender, sexual orientation but by inherent, just like the three classifications mentioned, mental capabilities with moving on to the next grade, garnering scholarships/preferential treatment and/or graduation and that deny and/or punish other students through inherent mental capabilities by holding back students in grade, not allowing students to take courses they may wish to take, and/or not getting diplomas, awards etc. . . .
As stated in the Missouri Constitution about the purpose of government (of which public schools are a part):
Promotion of general welfare–natural rights of persons–equality under the law–purpose of government.
Section 2. That all constitutional government is intended to promote the general welfare of the people; that all persons have a natural right to life, liberty, the pursuit of happiness and the enjoyment of the gains of their own industry; that all persons are created equal and are entitled to equal rights and opportunity under the law; that to give security to these things is the principal office of government, and that when government does not confer this security, it fails in its chief design.”
I contend that the rewards and denials as outlined above contravene Section 2 of the Missouri Constitution. I’d bet that most state’s constitutions have similar language. Someone needs to take advantage of the constitutional guarantees like Section 2 and challenge the standards and testing regimes as discriminatory.