This paper reviews the research on proprietary paper and pencial tests of integrity or honesty, which have effectively supplanted polygraph examinations in evaluating the moral attributes of employees and applicants. Moral integrity is a complex issue that encompasses more than conventional notions of honesty and is difficult to operationalize as a psychological trait or construct. Integrity test questions are largely derived from polygraph interrogations and the tests validated through polygraph results. The field studies reviewed and an exploratory test cast doubt on the ability of these paper and pencil instruments to meet standards of construct validity. Other studies show promise of predictive validity in some situations. Unfortunately, the research designs used to substantiate the predictive powers of integrity tests failed to hold other workplace influences constant. In light of these findings, employers are urged to exercise caution in the use of these tests until further independent research is reported because of potential infringements on privacy and equal opportunity.