"No person shall be convicted of any criminal or civil offence solely on the basis of the data contained within any digital storage media within their possession and the recording of any of their network addresses upon any other digital storage medium"
I'll be honest about my motivation for making this suggestion; I am appalled by the fact that people are frequently imprisoned for possessing/accessing child pornography which they did not produce, purchase, trade, or solicit. The argument that viewing child pornography creates an increased demand was formulated in a pre-internet era when people who were determined to view child pornography had to either produce, purchase, trade, or otherwise solicit the material in order to view it. In those cases - and in cases where pornography was abusive rather than just offensive to the sensibilites of the time - I believe that prosecution was justified. In the era of the internet, however, people are able to access child pornography without encouraging production, yet many of those people are traced through access logs, then arrested, convicted and imprisoned.
The suggested clause would not prevent the prosecution of people for purchasing child pornography, as card details would be recorded; these details could be coupled with data from the hard drive to secure a conviction. Anyone who trades child pornography could presumably be convicted, as evidence of trading should be available on another person's property. Anyone who solicits child pornography could likely be caught through their dealings with those who produced or distributed such images.
The suggested clause would also stifle attempts to introduce a local equivalent of MediaSentry et al, as such organisations rely heavily on evidence from users' computers and on the logging of the IP addresses of people who download copyrighted media.
Such a clause would also hinder the introduction of victimless criminal offences which are falsely alleged to discourage the commission of harmful crimes; the British and American legislators have begun to introduce such laws to bypass allegations of creating a police state obsessed with the concept of pre-crime. In the UK, for example, it is illegal for a person to possess information which could be useful to terrorists, on the absurd basis that anyone who wishes to view such material intends to engage in terrorist behaviour.
The reality is that the excuses provided for intrusion into peoples' digital lives are generally an excuse for the state to investigate the private lives of anyone who is presumed to wish to challenge the state, or anyone who may offend the electorate which legislators are forced to represent in order to maintain their seats.