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Comment by a3n | Hacker News Reader

> In the words of 4th amendment jurisprudence, we don't have a reasonable expectation of privacy in items we voluntarily disclose to third parties.

I would hope that thinking on this evolves, to the point that we have a reasonable expectation that information we've voluntarily disclosed to a third party stays between us and that third party. Because that is exactly my personal expectation, notwithstanding my other expectation that it will be violated.

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Mosaic theory doesn't go that far, but in the age of widespread statistical inference, it is an important development.

Generally speaking, the public is entitled to all evidence. Certain rights, such as the Fifth amendment, protect you from being compelled to testify against yourself, but you have no right to prevent, nor does anyone else have the right to refuse, to testify against or about you, except for a very small and declining set of common law privileges, and even those only apply in certain circumstances.

But the 4th does qualify with "unreasonable," and dragnets without "specific" suspicions are unreasonable and unconstitutional.

Indeed, and there's where we need mosaic the most. As it stands, the collection of this type of data (Smith) is not even a search, and therefore the court does not even consider whether or not it was reasonable. It just stops there. If it were found to be a search, it might still come in, but perhaps for a different reason. There's a great cartoon, which contains this awesome flowchart: http://lawcomic.net/guide/?p=2256

That is a matter of law, not thinking. We have specific laws in cases where you can expect that information you disclose to others should be kept secret. Attorney-client privilege, HIPAA, etc. That alone should tip you off that types of communication without such restrictions are not protected.

Law is an evolving matter of thinking and interpretation, not a set of instructions.

A great recipe for tyranny.

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