A Justice Department report reveals the Sinaloa cartel, led by 'El Chapo' Guzmán, employed a hacker to surveil the FBI and identify informants. The hacker exploited vulnerabilities in the FBI's cybersecurity, offering cartel leaders a 'menu of services' to access mobile phones and other devices. This allowed the cartel to track individuals, including those entering the U.S. Embassy in Mexico City, leading to intimidation and violence against witnesses in El Chapo's case. The report, based on testimony from a cartel insider, highlights the sophisticated methods used to compromise security and obstruct justice.