The Chain of Evidence

To be convincing in court, you must be able to show how the evidence was handled and processed from collection to presentation.
Any breaks or gaps in the chain introduce doubt.
Document each step and each way evidence is handled, stored, or processed.
Multiple backups should be employed.
Multiple integrity checks should be employed.
All analysis must be documented showing who performed it, how it was performed, what the results were, and how the results were preserved.

To be convincing in court, you must be able to show how the evidence was handled and processed from collection to presentation.