From 17-20 September 2018, UNLIREC, with funding from Germany, organized a course on interdicting small arms, ammunition and their parts and components in Guatemala City, Guatemala. This is the first time that this type of course was taught in Guatemala and it sought to strengthen the ability of the Guatemalan government to interdict the illicit trafficking of small arms and light weapons, ammunition and their components through postal services, packages and luggage. 40 participants from the Tax Agency (SAT), COMBEX-IM, and the Ports, Airports and Entry Ports of the National Civil Police (DIPAFRONT), with knowledge of package inspections and other postal and immigration services, were invited to attend. The theoretical and practical methodology training included ways to identify small arms, ammunition, parts and components through x-ray scanning, as well as methods employed to conceal objects in x-ray scanning. The IT platform for this training was developed by the Center for Adaptive Security Research and Applications (CASRA).