The fourth theory, the legal hypothesis ,is that prejudice can be eliminated by enforcing laws against discriminate  behavior. One could commit a crime if he or she violate the law, it depends on how severe you have violate,too. Most government from all around the world have set regulations about it. In order to implement the whole law.        

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Source:https://www.cliffsnotes.com/study-guides/sociology/race-and-ethnicity/prejudice-and-discrimination