This post is more a request for information than a provision of same.
I was discussing cell-phone privacy, and a friend mentioned that since the World Trade Center attacks all cell phones have GPS location devices that are trackable even when off. I was not sure of the accuracy of that statement (though we all know that the so-called PATRIOT Act was a vast overreaction and overreach), so I went hunting for current law.
I did not find much; I did find a government site from 2014 that had a link to a page about pending legislation; that page was updated 2 months ago (28 Oct. 2016). Here is the link:
The original page (www.gps.gov/policy) also had information on the 2012 Jones decision and on lower-court rulings, including one that required a warrant for GPS-based vehicle trackers (later vacated and to be reheard, according to the site today [26 Nov. 2016]).
I think we have some work to do, between all the other ball-juggling that is happening: Electoral College, vote recounts, proposals for mass registration and deportations, Dakota Access water-protector repression, racist appointments, etc. Already, many folks are talking about the need for encrypting e-mails and phone conversations/messages—is that actually useful, or just an illusion because Internet Service Providers give everything to the government, anyway?