While working for the Forest Service in the eastern Sierra the relationship between the USFS and the CHP was very good. During the 18 years I did this I had to assert the USFS authority and jurisdiction 3 times.
Once was in the winter when an earthquake occurred less than 0.5 kilometers under a major geothermal area with heavy public use. In this location it was essential that I inspect the area prior to anyone from the public arriving. It was snowing heavily and U.S. 395 was closed due to high winds, drifting snow and poor visibility. I drove down S.R. 203 to U.S. 395 where I found a CHP officer staffing a roadblock. I told him I needed to continue to my location using 395 as there weren't any practical alternatives. He told me he had the authority to prevent anyone from proceeding. No one was on the highway including Caltrans as the wind was making their plowing efforts ineffective. I would not be endanering others by driving on it. I reminded the officer that U.S. 395 was located on an easement issued by the USFS on National Forest lands. That easement, I told him, included a clause that the easement was issued on the condition that it cannot interfere with National Forest land management. I reminded him of the supremacy clause of the U.S. Constitution. I then told him that he was interfering with a federal officer by not letting me through. I then told him that with all due respect it appeared that my need to proceed trumped the CHP authority to close the road. We chuckled and he told me I was crazy to proceed. I then drove to a National Forest system road to the end of the plowing where I put on my skis and reached my destination. It snowed at the rate of 8" per hour and the visibility was such that I had to "feel the ground under my skis" to reach the recreation site.
One of my ancillary duties was as a claims and accident investigator and following a number of lawsuits claiming negligence on the part of the Forest Service in maintaining roads, required that we go to the scene of accidents on USFS roads. We had to determine if the construction and maintenance of the road was a factor in the accident. When I arrived on scene of an accident on a heavily used NF road the CHP was at scene the officer told me to leave and not interfere with his investigation. He looked at me like I was some sort of lookey lou. I then backed off, called my dispatcher and the USFS special agent called the CHP commanding officer, who in turn called his officer to allow me to investigate. I then had a chance to indicate what I was doing, that I wasn't going to do a duplicate investigation, that I needed a copy of his investigation, would not destroy any evidence and was merely there to document the condition of the road, the signage in place, stated my training qualifications, etc. From that day forward the relationship with CHP officers at accidents was excellent. The initial friction was because this was new to both agencies.
The last incident was the most disturbing. I was retired, but a member of the county's RACES (Radio Amateur Civil Emergency Service) and was there under the command of the S.O. RACES sergeant. Both the S.O. and the CHP located their command post about 10 miles away from the Incident Command Post. I was operating the radio at the county/CHP command post and accompanying the media inside the fireline. At one point the CHP and county wanted to have 395 reopened in spite of the highway being inside that line where engine and hotshot crews were working. Opening the road would expose the fire crews to dangerous traffic and the public to falling rocks as the closed highway was in a very steep and narrow canyon. The I.C. came to the LE command post to explain why the highway would not be opened. I had worked with the I.C. in the past as he had worked on the Inyo NF and the fire was located on the Bridgeport Ranger District of the Toiyabe NF where I worked for 7 years. I was had absolute confidence in the IC, who was a National Incident Type I Team in charge of this fire. After he left the CHP and county officers threatened to open the highway in spite of the IC's direction. I finally spoke up, after asking for permission to speak freely and with all due respect. I told them federal law stated they were working for this IC in spite of their claims they didn't have to follow his direction, because they stated they had ultimate authority over the road. I also had the supremacy clause and easement discussion I mentioned in my first incident. They took my words begrudgingly, but did not attempt to open the road. I spoke to them in a very calm and matter of fact manner.
A couple of weeks later I was working a large event in Mammoth providing communications for the event, the PD, etc. in a mobile command post. This time I was working for the PD. A fellow RACES member then told me that the RACES sergeant "was gunning for me because the CHP officer at the fire complained that I spoke to them when I shouldn't have, that I was disrespectful and harassed them. So much for interagency cooperation. Law enforcement agencies in some rural areas sometimes don't have a lot of large federal incidents and aren't practiced, nor trained well in ICS. They often cause coordination problems for the incident. When I've been on fires in southern California they understood ICS and law enforcement, including the CHP, L.A. County, San Bernardino County, Ventura County, Riverside County, Santa Barbara and San Luis Obispo County integrated well into the command structure. They always placed their "command post" at the Incident Command Post. They always helped us and worked hard as a part of the organization. At the large fire incident I spoke of there was plenty of room and facilities for the county/CHP to located at the Incident Command Post. They purposely chose to not locate there.
I had one other run in with law enforcement during the initial attack phase of a small fire near a USFS campground. I responded to evacuate the campground and a deputy was sent to assist. This peacock of a deputy arrived on scene just after the I.C. cancelled the evacuation as they had knocked the fire down. This deputy arrived and gave me hell that I stopped the evacuation. He pulled up on the dirt road at the entrance of the campground, skidded to a stop, which threw a large amount of dirt in the air toward me, the district's LEO and a dozen or more campers who were interested in the fire response and listening to our radios. The deputy stormed out of his rig, threw his hat onto the road, shouted my name and yelled out "what in the hell are you doing?" I replied in a very matter of fact manner, without my voice raised, and said I was following the direction of the IC, who he and I worked for on this incident. He stopped and stared at me while pointing his finger at me, without saying anything, picked up his hat and turned around on the dirt road and sped off.
I don't think cops are arrogant, They have to control scenes as soon as they arrive. If they lose control the scene becomes unsafe for them and the public in the vicinity. Anyone that has worked in law enforcement, which was one of the hats I wore, knows this. This is what officers are trained to do. Sometimes they get tunnel vision and don't integrate well with the other agencies on scene, as I have pointed out in the 3 incidents I related above. They don't work with ICS often, nor do they do a lot of mutual aid, especially at distant locations at large incidents. Firefighters are very used to mutual aid, traveling to distant locations and working in an ICS structure. ICS resulted in the fire family extending to every firefighting agency and making it the fire service, rather than individual agencies. Some law enforcement agencies and individual officers are reluctant to become a member of a greater public service family.
Arresting or detaining a firefighter at the scene of an incident on a highway when they are doing their job according to their agency's policy and directives is not a good thing. Every one at the scene of an incident needs to look at the big picture of what everyone is there for. Everyone shares a common goal, to serve the public, work for the safety of every person working the incident and provide for public safety. The management of the highway must be a part of reaching those goals and keeping it open in conflict with those goals should not be allowed. Everyone on an incident should follow the chain of command, which this officer is probably very familiar with.
It will be interesting to find out the details of this incident and what the justification was for the arrest. Things are often not as clear cut and simple as they first appear.