The Chief Justice on Fitbit, Riley v. California oral argument, 29 August 2014, p. 17

gistfile1.txt

    12 CHIEF JUSTICE ROBERTS:  What if you have a
    13 device that doesn't have the broad information that a
    14 smartphone has, but only a very limited, like a Fitbit
    15 that tells you how many steps you've taken, and the
    16 defendant says, I've been in my house all afternoon, and
    17 they want to check and see if he's walked 4 miles.  It's
    18 not his whole life, which is a big part of your
    19 objection.  Is that something they can look at?

From http://www.supremecourt.gov/oral_arguments/argument_transcripts/13-132_h315.pdf