In 2011 and 2015, Julien Prévieux organised drawing workshops with Paris police officers to teach them to draw crimes maps and visualization diagrams by hand rather than instantaneously by computer. Using the “oldfashioned” technique of drawing meant that these decision-making tools lost their primary function, because the results would always be finished too late. But loss at one level brought gains at others: the development of drawing skills, an opportunity to reflect on changes in policing and on new methods of management... and the production of some very fine abstract drawings.