This study establishes the reliability and validity of the Law Enforcement Officer Stress Survey (LEOSS), a short early-warning stress-screening measure for law enforcement officers. The initial phase of LEOSS development employed the behavioral-analytic model to construct a 25-item instrument specifically geared toward evaluation of stress in this population. The purpose of the present study was to examine psychometric properties of the LEOSS. Results indicate this instrument has good levels of internal consistency, test-retest reliability, and validity. Potential applications of the LEOSS in clinical and research contexts are discussed. The next phase of research on the LEOSS is discussed, and suggestions for directions that future research in this area might take are offered. (Contains 8 tables.)