Associations Between MMPI-3 and Psychosocial History Findings Obtained in Preemployment Evaluations of Public Safety Candidates

The present study evaluated the validity of Minnesota Multiphasic Personality Inventory-3 (MMPI-3) scores among police ( n = 1,294), correctional officer ( n = 190), dispatcher ( n = 205), and firefighter ( n = 237) candidates using psychosocial history data collected with the Psychological History Questionnaire (PsyQ) at a private practice in the Northwestern United States. MMPI-3 scale elevations at T score cutoffs specified in the MMPI-3 User’s Guide for the Public Safety Candidate Interpretive Reports (Corey & Ben-Porath, 2022) were examined. Consistent with previous research using the MMPI-2-RF, MMPI-3 T score means were lower and less variable in this public safety preemployment context relative to the normative sample. In addition, MMPI-3 scores were meaningfully associated with a number of aggregated scale scores derived from PsyQ data, particularly in the behavioral/externalizing domain. To address limited research on preemployment personality testing among female police candidates and the absence of research among nonpolice public safety occupations, Cohen’s q was used to compare validity coefficients across male and female police candidates and across police and correctional officer, dispatcher, and firefighter candidates. Differences were minimal, with all statistically significant effects being small in magnitude, indicating the MMPI-3 correlates identified with police candidates replicate to other public safety positions.