Findings show that competent examiners using ACE-V methodology should have little trouble determining whether or not latent fingerprint impressions were deposited at the same time. Eighty-eight percent of examiner decisions were correct in determining whether two or more fingerprint impressions were deposited at the same time. Even when there was a conspiracy by a second donor to mimic the orientations of the first donor's deposits, examiners identified these impressions as false nearly 85 percent of the time. Additional training and research should further reduce the error rate. The experiment consisted of a series of 30 latent fingerprint impressions that were sent to volunteer latent print examiners around the world. Their assignment was to examine each impression and apply ACE-V to determine whether the impressions were deposited at the same time. Thirty-one examiners submitted results for the study. Their experience levels ranged from 1 to 28 years, with a cumulative experience of 350 years. Fifteen States and 3 foreign countries were represented. All participants stated that they had been trained to competency, that they practiced ACE-V, and that they had completed some formal training in quantitative-qualitative friction ridge analysis. This training was a prerequisite for participation. Materials and methods are described in detail. 2 tables, 8 figures, and 12 references