Final answer:
The main challenge to translational criminology is integrating scientific research into criminal justice policies, which links academic findings to actionable strategies in the criminal justice system.
Step-by-step explanation:
The challenge to translational criminology that is best illustrated by the options provided is integrating scientific research into criminal justice policies. This integration process involves the application of findings from criminological research into practical strategies and policies within the criminal justice system to reduce crime and improve public safety. The other options, such as conducting experiments in controlled settings, analyzing crime trends with statistical methods, and implementing evidence-based practices, are all part of the research process or steps towards evidence-based practice, rather than challenges to the translation itself.