From Johns first post on this thread:
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Media: The rule allows the investigation to follow its course undisturbed and prevents witnesses being coerced by the suspect or material evidence being compromised; therefore it is extremely important at the initial stage of investigation.The principle of secrecy, to a larger or lesser degree, is in use in police forces around the world including the British police. However, differences may lie in the way that other police forces, particularly in the US and the UK, use the media as a vehicle for spreading information with the objective of bringing new evidence to the investigation.The PJ, with authorisation of the Criminal Investigation Judge (JIC), can provide information to the media.
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In that case when is a leak not a leak?
As for Jane Tanner she clearly broke Portuguese judicial secrecy laws (IMO), however "what to do" is key here.
Had her comments had a grossly deleterious effect on the case possibly the Criminal Investigation Judge in charge would have cut up rough. I do rather suspect that what she did was along the lines of not signing a "maroon book" driving licence (for those old enough to remember them). It was an offence not to sign it but unless one was found to have done a load of other hooky driving offences or been trappy to the speed cop it would generally be ignored.