This study examines the extent to which cognitive ability, the Big Five factor personality dimensions, and emotional intelligence are related to training and job performance of U.S. Federal criminal investigators. Training performance measures were collected during a 17-week training program. Job performance measures were collected 1 year after the investigators completed the training program. Conscientiousness was modestly related to training performance. Cognitive ability and emotional intelligence were positively correlated with job performance. Neuroticism was negatively correlated with job performance. The relative benefits of using emotional intelligence and the five-factor model to select law enforcement agents are discussed. (Published Abstract)