Juez, whose father had been jailed by the dictatorship that overthrew President Juan Perón in 1955,[1] was active in the Peronist Youth, earning a juris doctor in 1985.

[1] He was appointed to the Provincial Legislature in 1994 to fill a vacancy, and in 1995, was elected on a party list headed by fellow Peronist José Manuel de la Sota.

He ran for the office of Mayor of Córdoba in 1998; but he was defeated in the Justicialist Party primaries by Germán Kammerath, who had received de la Sota's endorsement.

The appointment proved contentious, however, when the director uncovered evidence of racketeering by, among others, Mayor Kammerath, Public Works Minister Carlos Caserio, and the governor's Chief of Staff (and wife), Olga Ruitort.

[4] Juez became a leading figure in the "transversal" trend among key center-left elected officials who, without belonging to the Front for Victory of President Néstor Kirchner, became his allies.

Juez alleged electoral fraud when in a protracted, 16-hour ballot machine-counting process at the Córdoba Central Post Office from which the press was barred, overloaded circuit breakers shorted numerous times.