How to Say "tampered with" in Spanish
The Spanish word for “tampered with” is “alterado” — C1 level.
English → SpanishC1
adjectiveC1formal
illegal changes to a document

Examples
La policía cree que el documento fue alterado.
The police believe the document was tampered with.
No comas eso, el producto parece alterado.
Don't eat that, the product looks spoiled.
Related Translations
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