Why do evaluation researchers in crime and justice choose non-experimental methods?

@article{Lum2005WhyDE,
  title={Why do evaluation researchers in crime and justice choose non-experimental methods?},
  author={Cynthia Lum and Sue-Ming Yang},
  journal={Journal of Experimental Criminology},
  year={2005},
  volume={1},
  pages={191-213}
}
Despite the general theoretical support for the value and use of randomized controlled experiments in determining ‘what works’ in criminal justice interventions, they are infrequently used in practice. Reasons often given for their rare use include that experiments present practical difficulties and ethical challenges or tend to over-simplify complex social processes. However, there may be other reasons why experiments are not chosen when studying criminal justice-related programs. This study… 

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