Her ruling in El Paso, Texas, Wednesday in the trial of Luis Posada Carriles, who is suspected in a string of bombings in Cuba in 1997, was a blow to prosecutors, said Miami-based El Nuevo Herald.
Lead defense attorney, Arturo V. Hernandez said a fax couldn't be directly connected to his client, although it was signed "Solo," an alias Posada reportedly used.
Cardone agreed and ruled the fax, which contained references to the Cuban bombings, was inadmissible.
Posada, 81, faces perjury charges for allegedly lying to U.S. authorities after he illegally entered the United States in Texas and applied for political asylum.
Prosecutors hoped to wind up their case Friday, but the illness of a former New York Times reporter scheduled to testify this week has apparently delayed their plan.
Cardone ruled that Ann Louise Bardach could delay her testimony until Wednesday and she suspended the nine-week long trial for Monday and Tuesday to give the jury a rest.