This study analyzes two decades of data from a municipal police agency and describes the average patrol officer career productivity trajectory. We find that declines in productivity begin immediately after the first year of service and worsen over the course of officers’ careers. After their 20th year, patrol officers generate 88% fewer directed patrols, 50% fewer traffic warnings, 58% fewer traffic citations, 41% fewer warrant arrests, and 57% fewer misdemeanor arrests compared to officers with 1 year of experience. Using a patrol officer productivity metric called Z-score per Productive Time (Z-PRO), we estimate that each additional year of service decreases an officer’s overall productivity by about 2%. Z-PRO also indicates that after 21 years of service, an average officer will be approximately 35% less productive overall than an officer with 1 year of service.