Tehran University of Medical Sciences Iranian Journal of Psychiatry 1735-4587 8 1 2013 03 15 14 9 Seyed Mehdi Saberi Legal Medicine Research Center, Legal Medicine Organization, Tehran, Iran. Ardeshir Sheikhazadi Department of Forensic Medicine, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran Mazaher Ghorbani Department of Forensic Medicine, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran Zaynab Nasri Nasrabadi Department of Forensic Medicine, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran AND Department of Pediatrics, Children's Medical Center, Pediatric Center of Excellence, Tehran University Of Medical Sciences, Tehran, Iran . Ali Pasha Meysamie Department Of Community Medicine, Tehran University Of Medical Sciences, Tehran Iran. Sayed Mahdi Marashi Department of Forensic Medicine, School of Medicine,, Tehran University Of Medical Sciences, 16 Azar Avenue Tehran, Iran. This research was supported by funding from Tehran University of medical science. 2015 10 14 Objective: In many jurisdictions, psychiatric problems are intended for commutation. Therefore, a forensic psychiatrist has an important role in detection of malingering. While several studies evaluate diagnostic tests, it is less known what symptoms are more likely to be imitated by malingerers. Method: In a prospective study 45 malingerers, who were diagnosed according to interviews by two forensic psychiatrists, from defendants with a judicial order for evaluation of mental status and criminal responsibility during a period of eighteen months were examined in legal medicine center of Tehran. Participants were assessed in another interview to determine symptoms. Dichotomous symptoms in felony and misdemeanor groups were analyzed using fisher’s exact test. The level of statistical significance was set at P<0.05. Results: Thirty-eight malingerers were charged with misdemeanors and seven with felonies. Behavioral symptoms were most frequently faked by 35 participants (77.8%). Participants charged with criminal accusation had a significantly lower mean age (P=0.032) and a higher level of education (P=0.008) than other non-criminal defendants. A statistically significant increase in memory function problems was demonstrated in the misdemeanor group (P=0.040). With regard to dual symptom imitation, statistically significant correlations were observed between thought content and perceptual symptoms (P=0.048) for felonies and mood & affect and thought process symptoms (P=0.034), mood & affect and behavioral symptoms (P=0.000) and cognitive function and behavioral symptoms (P=0.039) for misdemeanors. In general, many simulators attempted to mimic simple symptoms of behavioral disorders. Probably felony offenses need less accurate programming; therefore, their rates are higher in older, less educated participants. Conclusion: This study demonstrated that differences between presenting symptoms among different offenses may not be useful in  detection of malingering,; however, unusual dual symptom imitations may be useful, particularly when standard tests are not performed. https://ijps.tums.ac.ir/index.php/ijps/article/view/206 https://ijps.tums.ac.ir/index.php/ijps/article/download/206/202