The ACLU is trying to get the Michigan state cops to stop dumping mobile phone storage during routine traffic stops. At present the Michigan troopers use something called a Cellebrite UFE that slurps up recently dialled numbers, SMSes, Facebook/Twitter posts, emails, bookmarks, Web history, cookies, notes, MMS, IMs, lists of recent Bluetooth devices, journeys, GPS fixes, call logs, and a list of your contacts. 

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it is unclear whether people have been volunteering their phones to the Michigan State Police or police seized those phones during arrests. [DOH!]