Police officers in Mexico must pass an examen de control de confianza, a trust control exam. In May 2026, El Imparcial wrote that it “es obligatorio para el ingreso y permanencia de policías en el País” (is mandatory for police officers to join and to remain in the force in the country). It includes toxicological, psychological, polygraph and medical tests, and a review of the officer’s social environment.
In this exam, confianza is measured by tests, among them a polygraph.