See Utah Code 77-7-6, posted at #102. It says the officer must announce the arrest first does it not?
FIRST: A big THANK YOU for finding and posting the relevant section of Utah Civil code applying to the situation in question. My hat is always off to someone who is willing to support their side of a debate with ‘facts’.
Now. I think the following part of the code applies in this situation. The court will judge if that is true or not.
Such notice shall not be required when:
(a) there is reason to believe the notice will endanger the life or safety of the officer or another person or will likely enable the party being arrested to escape;
JUST WHAT DID THE DRIVER WANT TO ARGUE ABOUT?