A campaign by Rotterdam city council to draw attention to the impact of illegal drugs has stimulated a different sort of crime this week, as students and others stole street signs referencing cocaine, ketamine, and MDMA. Council officials decided to “rename” 11 city street signs using drug references so, for example, Coolsingel became Cokesingel, the Ketenstraat became Ketastraat and Laan op Zuid became Lijn (line) op Zuid. They hoped to stimulate discussion about the use of illegal drugs on wider...