The approach treats laws as a tool that needs to be regularly reexamined and adjusted, whereas treats laws as evolved to reflect the principles found in nature.

The legal realism approach treats laws as a tool that needs to be regularly reexamined and adjusted. It defines legal rights and legal duties as whatever the courts say they are whereas "natural law" treats laws as evolved to reflect the principles found in nature. It’s a body of unchanging moral principles regarded as a basis for all human conduct.