Objective: this research aims at analyzing the expert reports released by the Scientific Police of Pará through sociodemographic data, gender and amount of cocaine received by the Public Security agency in the period from 2018 to 2020 regarding seizures in the municipality of Santarém/PA and adjacent cities. Methodology: this research is an exploratory and descriptive study with data validated in definitive expert reports of chemical analysis, performed on cocaine samples from seizures by police agencies in the state of Pará. Results: a total of 1,280 definitive expert reports with positive results for cocaine were consulted. With this, there was prevalence of males in involvement with trafficking; regarding schooling levels and age groups, this information was missing from the reports; in relation to seized cocaine there is growth in trafficking in 2019, with Santarém as the central city for trafficking in this region. Conclusion: the cocaine quantified in this study shows that, during the three years of analysis of data from the Scientific Police of Pará, a reasonable number of seized cocaine was noticed, not only in the city of Santarém, but also in adjacent cities, indicating active circulation of this substance in the western region of Pará, also pointing to male presence, mostly, in trafficking of this substance.