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On top of that, violating public records laws by using signal chat for official communications with disappearing messages turned on.

Are there settings you can apply to Signal that make them compatible with record retention laws?

No. Signal stores messages only on the receiving device by design.

If there were it would still be irrelevant. They specifically used the settings to delete messages after a few weeks.

No.

Turns out you don’t need FOIA when the participants free the information by accident.