How to Say "arrests" in Spanish
The Spanish word for “arrests” is “detiene” — B1 level.
English → SpanishB1
verbB1formal
a suspect

Examples
La policía detiene al sospechoso cerca de la escena.
The police detain the suspect near the scene.
El oficial detiene a la persona por exceso de velocidad.
The officer stops/detains the person for speeding.
Using the Personal 'a'
Because 'detiene' is acting on a person or pet (the direct object), Spanish requires the preposition 'a': 'detiene a la persona'.
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