Selective incorporation of the Bill of Rights is an essential doctrine which guides the federal government to prevent states from enacting laws which in some way violates the basic structure of the constitution.
Today, modern Supreme Court doctrine embraces the doctrine of selective incorporation of the Bill of Rights against the state as it limits the endless power held by the government. Through the Due Process clause of the Fourteenth Amendment, selective incorporation has effectively become part of the constitution. This policy is mainly aimed to protect citizens from laws and procedures developed at the state level. It was thought by some political experts that unlimited power to the federal government would limit the individual power vested to the people and hence selective incorporation is essential to be a part of the Bill of Rights.
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