Clearance rates is the number of clearances/number of offenses. In other words, it is the likelihood of getting arrested. These are used by various criminal justice groups as a measure of crimes solved by the police.
In System Conflict Theory, it is argued that clearance rates cause the police to focus on appearing to solve crimes (generating high clearance rate scores) rather than actually solving crimes. Further focus on clearance rates may result in effort being expended to attribute crimes (correctly or incorrectly) to a criminal, which may not result in retribution, compensation, rehabilitation or deterrence.