http://www.mondaq.com/article.asp?articleid=41862&email_access=on
Sally Ramage
"This is the type of digital evidence report that is valid in a court of law and which can be used in court, the digital evidence expert having used such scrupulous procedures, that his report is utterly valid and carries great weight…..When dealing with digital evidence, the following general forensic and procedural principles apply.
Actions taken to secure and collect digital evidence should not affect the integrity of that evidence.
Persons conducting an examination of digital evidence should be trained for that purpose.
Activity relating to the seizure, examination, storage, or transfer of digital evidence should be documented, preserved, and available for review. The aim is to conduct an accurate and impartial examination of the digital evidence."