Mexico’s notorious Sinaloa cartel, once ruled by now-jailed drug kingpin Joaquin “El Chapo” Guzman, has barred the production of fentanyl — under penalty of death. The about-face by the narco crew — the main trafficker of the deadly synthetic opioid flooding the US — comes as El Chapo’s kids bow to a mounting law enforcement crackdown on the drug trade, the Wall Street Journal reported Monday. The order came from the “Chapitos” — the name for Guzman’s sons, who took over the operation. “In Sinaloa, the sale, manufacture, transport or any kind of business involving the substance known as fentanyl,...