From this article:
“‘There’s a lot of speculation that the Sinaloa cartel has beaten the Juarez cartel, and that they’re in charge of the city now,’ says Molly Molloy, a researcher at New Mexico State University who has studied violence in Juarez. ‘But there’s also less people to kill. Most of the people killed were young men between the ages of 15 and 30. There’s less of that demographic around.'”
“On one of [Police Chief] Leyzoala’s first days, a banner surfaced over a local highway: ‘Welcome to Juarez, Leyzoala. Tonight we kill you.’ He survived the night, but the next morning brought a fresh threat: a police officer would die every day until he quit. By dawn, one of his cops was found dead in the street, and another the next day.”
“Leyzoala ‘purified’ his force, firing or arresting roughly 800 dirty cops.