In this quasi-experimental 2 x 2 factorial design study, the impact of an academic integrity module and Turnitin® on undergraduate student similarity index scores was investigated. Similarity index scores were used to measure suggested plagiarism rates of student papers. A purposive sample consisting of 96 undergraduate education students enrolled in 4 sections of a course in a Southeastern university was used. The 4 intact groups were randomly assigned to each main factor. Neither main factor nor their interaction were statistically significant. Overall, the plagiarism rate as measured by the mean similarity index score of the participants who completed the academic integrity module and submitted papers through Turnitin® was the lowest, followed by the mean similarity index score of the participants who completed the academic integrity module but did not submit papers through Turnitin®, and then the participants who did not complete the academic integrity module and did not submit papers through Turnitin®. Participants who did not complete the academic integrity module but submitted papers through Turnitin® had the highest mean similar index score, suggesting a higher plagiarism rate as compared to the other groups. Recommendations for future studies are made.