Maps showing the concentration of gun and drug warrant executions on homes between 2017 and 2020 [Chicago Office of the Inspector General]

The Chicago Police Department has registered a nosedive in the number of raids it’s executed on homes during the past two years, as police leaders have repeatedly tightened department policies to rein in warrant executions. But the shift is moving so fast that the department’s existing systems can’t tell whether the new rules are having any effect, a city watchdog wrote in a report published Thursday.