Which theory argues that law should be based on empirical evidence and practical outcomes?

The theory that argues law should be based on empirical evidence and practical outcomes is Legal Pragmatism. Legal Pragmatism emphasizes the importance of considering the real-world implications and effects of legal rules and decisions rather than adhering strictly to abstract principles or pre-determined ideologies. This approach advocates for a flexible and results-oriented legal system, where laws are evaluated based on their effectiveness and ability to address societal issues, rather than simply fitting into a theoretical framework or deriving from moral reasoning alone.

Legal Pragmatism encourages lawmakers and judges to utilize data and practical experiences to discern what works best in achieving justice and resolving conflicts within society. This leads to a legal system that is adaptable and responsive to changing circumstances and community needs, focusing on tangible benefits and social outcomes.