This thesis examines the Mexican federal judiciary and the problem of corruption in this institution, particularly related to cases of drug trafficking. Given the clandestine nature of corruption and the complexities of this investigation, ethnographic methods were used to collect data. I conducted fieldwork as a "returning member" to the site under study, based on my former experience and interaction with the federal judicial system. I interviewed 45 individuals who work in the federal courts in six different Mexican cities. I also studied case files associated with an important criminal trial of suspected narco-traffickers known in Mexico as "El Michoacanazo." My study reveals the complicated nature of judicial corruption and how it can occur under certain circumstances. I conclude that the Mexican federal judiciary has become a more professional, efficient, and trustworthy institution over the past fifteen years, though institutionalized practices such as nepotism, cronyism, personal abuse of power, and gender inequalities still exist, tending to thwart the full professionalization of these courts and facilitating instances of misconduct and corruption. Although structural factors prevent full professionalization and corruption does occur in these courts, the system works better than it ever has before.