This would not be acceptable to me:
The Michigan State Police have a high-tech mobile forensics device that can be used to extract information from cell phones belonging to motorists stopped for minor traffic violations.
If a cop were to ask me to allow him to connect his device to my cell phone the answer would be, “No”. If that wouldn’t be allowed I would attempt to do a hard reset of the phone (know how to do this so you can do it quickly) or attempt to call someone who could remotely wipe it for me.
Via email from retired co-worker Chet.