Final answer:
Detaining individuals at the highest risk of re-offending is known as selective incapacitation, a strategy aimed at preventing future crimes by specifically targeting and removing high-risk offenders from society.
Step-by-step explanation:
Detaining only those who are at the highest risk of re-offending would be a form of selective incapacitation. This approach aims to prevent future crimes by removing those deemed most likely to commit further offenses from the community, which contrasts with general deterrence (meant to prevent the general population from committing crimes), specific deterrence (meant to prevent a particular individual from re-offending), and general incapacitation (imprisoning a wide range of offenders to reduce crime).
Selective incapacitation focuses on the reduction of crime by identifying high-risk individuals and intervening in a way that limits their ability to cause further harm, which is considered a more targeted strategy within the criminal justice system.