The city of Guadalajara erupted with cartel violence this past weekend, alongside other parts of Mexico, after an army raid left a notorious drug lord dead. Now, Guadalajara is looking ahead nervously to the World Cup this summer, in which it will host four games. Authorities are turning to technology to keep its slice of the planet’s premier sporting event safe, as Mexico is co-hosting the tournament with the United States and Canada. Drones, anti-drone equipment and AI-driven video surveillance systems are some of the tools the state government of Jalisco — of which Guadalajara is the capital — will deploy to provide security. The preparations come as Jalisco endures an epidemic of disappearances and the discoveries of clandestine graves, with Guadalajara having more of its residents...