High school is the time of the greates incidence of academic dishonesty, which is later carried over to further education. Academic dishonesty and all other forms of cheating are alarmingly threatening to our society, and thus to our profession. This research sought to examine the incidence of dishonesty in written tests in the Medical School Šibenik with regard to the general success, direction and grade of attendance.We studied the causes of dishonesty and how they can be prevented. The paper examines students' attitudes about the implications of dishonesty and their acceptability, as well as the reasons that lead students to unethical behavior. Students from the Šibenik Medical School participated in the research. Out of the total number of respondents 155 (students), 75 (48,4%) are nurses-general technicians and 80 (51,6%) are students of pharmacy. Participants in this research filled out a questionnaire modeled on Šimić Šašić and Klarin (2009.) as a measuring instrument. The results showed a high percentage of cheating on knowledge tests. In the domain of the attitude about the acceptability of cheating, most respondents agree that cheating is completely natural and inherent in human nature. Looking at the grades, fourth grade students have a significantly more pronounced attitude about the acceptability of cheating compared to 2nd and 5th grade students. In the domain of cheating reasons which is divided into internal and external the most common internal reasons they cite are too little time to learn, because they want to help a friend and desire for good grades. External reasons such as poor supervision, injustice, and difficult examination are the most common reasons for cheating. Girls have more pronounced internal and external reasons for cheating than boys. Research has confirmed that academic dishonesty is a routine phenomenon among students. The students them selves do not consider cheating to be ethically wrong and relativizeit in a number of ways.