there is an infamous case of a child pornographer or pedophile in California that is sometimes cited by law enforcement representatives as a good example of the evils of encryption: supposedly he encrypted his diary and it couldn't be unlocked by them. this was mentioned in the article.
but I have a question: how did they know it was his diary?
If I remember some earlier discussion about that case from a few years ago, the file was called "diary.pgp".
how did they know it was *his* diary? granted, this is highly suggestive, but again not conclusive. it could be his friend's diary, or a diary of his flowertending, or whatever. sure, a government agent could insist, "well, don't be a bonehead. it's obviously his diary, and surely contains all his crimes against children". ah yes, just as, obviously, even before trial, "the man is a criminal"