The Supreme Court "signaled sympathy with the 'mosaic' theory of privacy..."

"The mosiac theory holds that aggregating lots of pieces of information about an individual that in themselves may be harmless may nonetheless, taken as a whole, constitute a search — even if all the data is public."

That reminds me of one of the most useful books I've ever read: "Seeing Like a State: How Certain Schemes to Improve the Human Condition Have Failed."