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All but one of the previous six outcome evaluations of police early intervention (EI) systems report favorable impacts on officers’ conduct, yet all but one – the same one – also rest on fairly weak designs – with either no control group or a control group that differs from the treatment group in key respects, with no use of control variables to adjust for those differences, and with no account of officers’ activity levels. We executed stronger designs in outcome evaluations of each of four agencies’ EI systems.