I'm very familiar with this incident since I live only a 15 minutes from where this took place. The police department ( Hazelwood ) is a small community located in the north county of St. Louis County. Typical small city community cops with some that are very over zealous in their line of work. I lived in Hazelwood a long time ago for a spell and Hazelwood has always had somewhat of a reputation for some of their police officers.
Hazelwood is a dying community with a shifting population from good citizens to an ever encroaching population of sh*t bags and criminals. Now the city of Hazelwood also has a fire department, but the city is bordered on one side by Robertson Fire Protection District which was one of the responding agencies on this particular call and the captain for Robertson was the individual subjected to arrest.
Clearly the arresting officer has some sort of "authority complex". I've seen this before in the past, particularly where law officers seem insanely focused on keeping traffic moving in light of safety concerns. As we all know this concept has drifted into the past in favor of securing a safe scene even if it requires a complete shut down of the highway. However, as the video can attest, this law officer didn't "get the memo."
I now live in St. Charles County, Missouri and the municipal police and county sheriff's deputies have a very good and close working relationship with fire and EMS. In my travels riding with various EMS providers throughout the country, the excellent working relationship with law officers is equally observed.
Mark this incident as one bolstered by the ignorance of a police officer and his over zealous behavior of jointly working an accident scene.