I don't know if you're police force does this but the one in Washington county will always defer an accident to a traffic officer rather than a patrolman. Traffic cops have to spend alot of time taking courses on what to look for to determine speed of impact and things like that.
In my experience (one wreck my fault, riding with two other people) they don't even talk to anyone first before they take a look at the damage and any other evidence. They are pretty good about it.
The lady I hit accused me of speeding recklessly(*) while she was crawling up a hill behind a dump truck. Officer let me off as light as possible as it was apparent I barely hit her. He laughed when she said it, because if I had been doing even 20 when I hit her it would have injured both right-side passengers, she insisted still that I had been doing 50 when I hit her.
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