Legal positivism is opposed to natural law theory and to legal interpretivism.

This claim is justified using natural law theory.

He has been a leading advocate for natural law theory over the past twenty years.

His paper Excuses has had a massive impact on criminal law theory.

Natural law theory remains at the heart of Catholic moral teaching, for example in its positions on contraception and other controversial moral issues.

His academic contributions are about political, social, and law theory.

This marked an important departure from medieval natural law theories which gave precedence to obligations over rights.

This is the opposite of the main claim of natural law theory.

A textbook in common law theory (in two volumes; 1932-1938)

Nonetheless, "natural law theory is very much alive and well."