Reps. Ed Markey (D-Mass.) and Joe Barton (R-Texas) sent letter to AT&T, Sprint, Verizon, and T-Mobile to ask "what personally identifiable information is stored, how long it is kept, and for what other purposes it's used." Responses are expected no later than April 19 and were prompted by an article in Germany's Zeit Online highlighting a cell carrier stored thousands of data points for one individual over six month. We highlighted that story in our "Worth a Click" feature; it highlights articles of interest in other online publications.
One bill is on top in Congress to mandate reasonable cause before enforcement officials can access such data. (APB coverage)