I agree with you 100% on keeping to LE diving separate from commercial work!
That said, I have been exposed to political pressure in this area in the past. My Sheriff's department when I first started diving was controlled by an elected Sheriff. He had absolute control of hireing and fireing. (Later Washington State voted in Civil Service for Sheriff's Departments.)
During this time of non-civil service (1957) an Unlimited Hydro plane (Thriftway) hit a USCG 40 footer on Lk, Washington and sunk it during a Goldcup race. My dive team at the time consisted of Sheriff's Reserve Divers and me, as the only full time paid Deputy. The team recovered the USGG boat the next day. The Thriftway Hydro was impaled into the side of the USCG boat, however; on bringing the USCG boat to the surface it broke loose and sank back to the bottom in 90ft.
The Thriftway people tried to pressure the team to recover their boat too. The team made the decision that recovering the Hydro was in fact a commercial salvage job. The next day while on patrol and after having made a body recovery dive in the AM I got a radio call to hit a phone and call "The" Sheriff. As you can well imagine I was a little startled to receive such a call as a Deputy. The Sheriff said he had talked to the Thriftway people and he wanted me to recover the Hydro. I explained what the team had said, etc. He wasn't buying that and insisted that I carry out his order. Keep in mind that I served at his pleasure had no civil service, etc. I also had a wife and three kids to support.
So, I said yes sir and proceeded to try and get a dive partner from the team to help me. I was able to get one of the Reserve Divers to help me. We managed to locate the Hydo again and hook it up for recovery. There was no light at 90 Ft. in Lk. Washinton. The Hydo was sitting on it's aft on the bottom. (Caused by styrofoam in the bow.) I don't recall how long the boat was but to us at the stern it looked like the Empire State Bldg. It took us over 30 minutes at 90 ft. do find it and get it hooked up.
The dive that I had made earlier in the day was on my mind, plus the 30 minutes at 90 ft. I wasn't to concerned because the earlier dive was shallow (25 to 30 ft.) As it turned out I should have been. Remember this was before computers, etc. In any case I got the bends later and had to spend 35 hours in the 'chamber at the Naval facility at Key Port, WA. This of course was my fault and not what I'm trying to express here. Although the pressure caused by the Sheriff tasking me to do this no doubt had some bearing on my actions.
My real goal here is to bring out that even today, I'm sure that in some jurisdictions that full time deputies or police officers may not have civil service coverage and may serve at the pleasure of an elected Sheriff, City council, etc. In this type of situation they will be placed under real pressure to carry out recoveries that they may deem as not their job. They may well be faced with loosing their job, should they decide to not carry out the task at hand. It's a tough decision especially in this time of high unemployment, etc.