Conza

Deductive  legal  theory,  when  properly  applied  in  a  given  context, objectively and descriptively defines the parameters of what justice is in relation to questions of property rights, contracts, torts, and other legal matters. This yields  a  deeper-than-expected  foundation  for  the  traditional  libertarian insistence  on  not  mixing  law  with  morality  and  the  corollary  opposition  to “legislating  morality.”  Legal  theory  is  a  discrete  field  that,  like  Mises’s conception of economic theory, can provide descriptive, categorical input for use in “ought” considerations, even as legal theory and ethics remain distinct in foundations, scope, and method.

(Source: libertarianpapers.org)