Learn the tone, meaning, and better English alternatives around "investigating cases from" with real scene examples.

It means the speaker is describing the practical difficulty of investigating something old or complex.
From Rosy Psycho, Episode 8
The speaker is explaining that very old cases are hard and time-consuming to investigate.
Use this in formal explanations, especially about police work or research. It sounds more like a statement than a reusable everyday phrase.
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