In plain words
It lets a court, an insurer or a regulator rely on evidence by showing it was not changed along the way.
Why it matters to a firm
We do not provide a formal chain of custody. Each finding carries its date and the public record or lookup behind it, so anyone can check it again.
The check behind the finding
For your own records: save the date, the source address and a copy of what you saw, and note who collected it.