Abstract
In Brazil, sexual crimes are very frequent. The proper collection, packaging, transport and processing of biological samples is important for the continuation of the investigation and resolution of cases. The formulation of specific laws and the implementation of genetic profile banks meant that profiles from biological samples were submitted to genetic banks to carry out genetic confrontations. In this context, the aim of this article was to analyze DNA samples from sexual crimes, attended by the Forensic Laboratory of POLITEC-AP, stored between 2008 and 2021, evaluating the quality of these samples. A total of 860 samples were processed, which included samples collected from the vaginal, vulvar, anal, oral region, among others. From total, 12.91% presented degraded DNA, with the year 2009 having the highest percentage of degradation, in relation to the total samples stored for each year, with 47.06%, and the year 2018 with the lowest percentage, corresponding to 1.35%. The samples of vaginal origin were the ones that presented the highest percentage of degradation for nine of the fourteen years evaluated. However, only samples collected from the vulvar region had a positive correlation with the variables year, average of mixtures and average of degraded samples. A total of 318 samples (36.98%) had their genetic profiles deposited in the BNPG, with 2010 being the year with the highest percentage of deposited profiles (60.52%). Genetic profiles deposited in the BNPG can help in the resolution and investigation of sexual and other crimes, thus contributing to the reduction of crimes.