We can step outside of government examples, too, and find cases where corporations getting all data sciencey with this information have accomplished some pretty ucky - and also impossible to anticipate - things.

An instructive case here is Target figuring out that they could use customer purchase history to detect, with a pretty decent degree of confidence, when a customer was pregnant. They then proceeded to use this model to send out mailings, and those mailings resulted in people being outed in rather compromising and potentially seriously harmful ways.