The study examined the validity of using the California Psychological Inventory (CPI) as a tool for police selection. The mean CPI profile of 211 police applicants was first compared to that of the CPI norms. Five performance criterion measures--retention on the job, academy grades, supervisory ratings, commendations, and reprimands of police officers--were studied to investigate their relationships with the CPI scales. The results indicated that there were significant mean differences on all the CPI scales between police applicants and CPI norms. The scale of Flexibility significantly differentiated the criterion groups of retention on the job. The CPI was useful in predicting academy performance; however, it did not correlate well with job performance as measured by supervisory ratings, commendations, and reprimands.