The appellate court sustained the sterilization law as compliant with both the state and federal constitutions, and it then went to the United States Supreme Court. Buck and her guardian contended that the due process clause guarantees all adults the right to procreate which was being violated. They also made the argument that the Equal Protection Clause in the 14th Amendment was being violated since not all similarly situated people were being treated the same. The sterilization law was only for the "feeble-minded" at certain state institutions and made no mention of other state institutions or those who were not in an institution.