The courses organized at the national level had the objective to train law enforcement forces by providing a refreshed knowledge on investigations and enhance cooperation in criminal investigations between police services. The training consisted of the training on the iARMS database, fingerprints, DNA, and how to gather evidence from crime scenes where firearms have been used. The courses were delivered with the technical and financial support of the project “Support to the fight against illegal possession and trafficking of firearms in Central America and neighbouring countries” managed by the CASAC program of the Secretariat General of the System for Central American integration (SG-SICA) with funding from the European Union, and the accompaniment of the Regional Bureau of INTERPOL in El Salvador. This joint training initiative, aimed at delivering firearms training, was carried out in the following member countries from Central America: El Salvador, Belize, Dominican Republic, Honduras, Guatemala, Costa Rica, and Panama.