No warrant required. It's argued that this is transactional data, necessary to do business, so it's free for the taking. This is the case that says so: http:/

No warrant required. It's argued that this is transactional data, necessary to do business, so it's free for the taking. This is the case that says so: http://en.wikipedia.org/wiki/Smith_v._Maryland http://en.wikipedia.org/wiki/Smith_v._Maryland And these are the laws that allows it: http://en.wikipedia.org/wiki/ECPA http://en.wikipedia.org/wiki/ECPA http://en.wikipedia.org/wiki/Stored_Communications_Act http://en.wikipedia.org/wiki/Stored_Communications_Act Somewhat unrelated, but under current law (the two above) they can read your emails without warrant too, but this was a big step: https://www.eff.org/deeplinks/2010/12/breaking-news-eff-victory-appeals-court-holds https://www.eff.org/deeplinks/2010/12/breaking-news-eff-vict...