With the advent of the original CVR,guys were hyper' at erasure at the end of the successful flight! Then pilots being the lazy guys they are didn't bother,after all the info' was only to be used in the event of a major(fatal) accident..Then the case of accidents occuring in europe coming under the 'ruling' of judges clouded the issue of 'privileged' information(which, until this,CVR's time had only be Heard by the accident people and crew).Some judges released information to all and sundry,they were above ICOA!!!Next we had the cases in 'Industrialized nations where the Coroner tried to 'Investigate 'the accident through the Witness box,again the issue of 'privelege' arose.. Finally the 'leaks' of the NTSB's cases, and the Latest "stipulation" by the Investigators of the UK/Canada that the CVR can be used in investigating 'Incidents',have done very little to appease the original pilots concern re outside interference.(Police action,or US Lititagtion)