In re Gault
Before In re Gault, juveniles accused of crimes had very few rights.  In re Gault gave due process rights, which juveniles had never had, to children and teenagers being accused of crimes.  These protections apply to all juveniles in the United States, not just Arizona.  After this decision, by law, all juveniles being accused of crimes must be given the rights in the Fourteenth Amendment.  For example: