[blueash]

With all the data the car is retaining, why is it not standard procedure for police to access and retain the data in accident investigations?
You would see speed, braking, and cell phone use at a minimum on modern cars with android or apple auto systems.
It would be obvious who was speeding, or never hit the brakes, or was on the phone at the time of the crash. As long as the car is collecting the data, derive some societal benefit. But no, the cop can't pull you over for a broken tail light and then access your data to see if you also were speeding.