The Obama administration earlier this month petitioned the Supreme Court in support of a federal court ruling that allowed police searches of cell phones records without a warrant.
They discovered that the Apple iPhone and iPad were recording user locations in a hidden file, detailing every step of their whereabouts and keeping a history of it for nearly a year. Apple has since changed that policy.
http://www.foxnews.com/politics/2013/08/21/cell-phone-data-latest-threat-to-privacy/Which is more important to the federal government? Where you have been, or your Bitcoin transactions?
Bitcoin is more important to the government.
TAXES are the only thing the government cares about. You can't tax someone's location (although I wouldn't put it past the IRS), but you can most certainly try to tax their Bitcoin transactions.