If you are a black driver in USA, you should immediately install a dash cam facing the interior of your car.
I’m about to do that
This is one that has a built in mic and films both inside and outside the car with a rotating lens with night vision and saves footage on an SD card.
It’s fairly low profile too (fits over your rear-view mirror) so even if a cop tries to take your phone, they may not notice it. If the shit goes down with iPhone blocking people taking video, it wouldn’t affect this.