But getting mobile phone records after a crash typically involves a court order and, and even then, the records may not show much activity beyond a call or text.

Sounds like we need a new law removing such a burden keeping these good officers from doing their jobs! /s

Seriously, you can't blame all of this on cellphones, you have got to blame the car manufacturer's as well, those "infotainment" centers they all use now are ridiculous. If the radio station isn't programmed into it you can't just search from the steering wheel, you need to reach over and scroll through catagories, then find one of the dozen stations in that category, what if you want Pandora instead, well then you need to be sure the bluetooth is on and connected, then you need to reach over and tap some buttons to get to the screen then scroll to the app, what you don't like that station, here lets get another one. This is a far cry from years ago where you just hit a seek button to scan all available stations and hit it again to stop on one you wanted, or when you just hit a button to switch from AM to FM to Tape to CD. Hell, in the Tesla Model 3 you don't even have a dashboard, instead of glancing down you have to turn your head and look at the info center.