In addition, lots of election officials complain that paper audit trails cause more problems than they solve.

NPR: Congress Plans to Address Electronic Voting

Prevention alone won't work, so audit trails and other measures are needed on top of the preventative approach.

CNN: Global panel issues Internet security recommendations

"The options exchanges have, and thus ORSA has, audit trails with which to perform their regulatory functions, " she said.

WSJ: Writing on the Wall: Insiders on Heinz Deal Have Company

Companies need defensible audit trails, especially for patents so that they can show how and when an idea was conceptualized and developed.

FORBES: Enterprise Management of Intellectual Property

It said that while much of this was due to failings in information management systems, it has a suspicion that there may have been "deliberate malpractice" which involved destroying audit trails and concealing evidence.

BBC: Negligence not collusion led to Billy Wright murder