How to Say "prosecutor's office" in Spanish
The Spanish word for “prosecutor's office” is “fiscalía” — B2 level. This is a very common word in everyday Spanish.

Examples
La fiscalía presentó pruebas contundentes contra el acusado.
The prosecutor's office presented compelling evidence against the accused.
El caso fue transferido a la Fiscalía General.
The case was transferred to the Attorney General's Office.
Trabaja en la fiscalía investigando crímenes financieros.
She works in the District Attorney's office investigating financial crimes.
Always Feminine
Since 'fiscalía' refers to an office or institution, it is always feminine, requiring feminine articles and adjectives: 'la fiscalía', 'una fiscalía fuerte'.
Confusing the Office and the Person
Mistake: “Using 'fiscalía' when you mean the person. E.g., 'El fiscalía es inteligente.'”
Correction: Use 'el fiscal' (the prosecutor) for the person, and 'la fiscalía' for the institution. 'El fiscal es inteligente.'
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