BAD IDEA!
Refer to the Fourth Amendment.
It would be nice to know if a teen was texting when they smacked your bumper and caused over $2,000 worth of damage though. Happened to me a few years ago and yes she was texting.
Like I said, the law would have to exclude any evidence other than the time of the last call. Anything else would be inadmissible in court.
I've heard of that, years ago in a history class. Wasn't that part of the Constitution back before Obama fundamentally transformed America? I have no problem with a warrant based upon probable cause, supported by Oath or affirmation, and particularly describing that either my cell phone or my cell phone records are to be searched, but otherwise my right to be secure in my person, house, papers (including my cell phone provider's records), and effects (including my cell phone) against unreasonable searches and seizures shall not be violated.