Goodhart’s law: when a metric becomes a goal it is no longer a valid metric.
“If they have burglaries that are open cases that are not solved yet, if you see anybody black walking through our streets and they have somewhat of a record, arrest them so we can pin them for all the burglaries,” one cop, Anthony De La Torre, said in an internal probe ordered in 2014. “They were basically doing this to have a 100% clearance rate for the city.”
Source: Biscayne Park, FL police told to frame black people, probe found | Miami Herald