AcpoCTEC

Principle 1: No action taken by professionals should change data that may be relied upon in court.
Principle 2: If you have to change the data, you must be competent to do so, with reasonable justification.
2.1.3 Principle 3: Keep a record processes used. A third party should be able to examine those processes, achieving the same result.
2.1.4 Principle 4: The person in charge of the investigation has overall responsibility for ensuring that all principles are adhered to.