I am trying to say that are more chances for a policeman to look at my smartphone, out from my car, instead of entering in my car even just with his head.
I even don't now if they can go into a car and if their regulations accept a policeman to enter into somebody car. It is also about their safety.
Also you know that almost people here are hiding the camera under the rearview mirror (even is a camera with display and is possible to need it) so is almost impossible to watch a video without unmounting the dashcam or the mirror. When unmounting the dashcam the driver must to take out also the power wire because many dashcams have capacitors inside so playback is impossible without permanent power.
And to not "redo everything", the best for policeman is to have the evidence before the video witness leave the accident scene. Again, with a smartphone, wirelessly you can have the backup and give the card without any fear.
For me is very simple and good this wireless idea. Many people think is useless or too much for them. But someday they will learn is a must.
enjoy,
Mtz