My station was setting off all the alarms at a local car dealership. Well the local police came to investigate this every Sunday morning or when ever I "pumped up" for DX talking. The Fcc considered this hindering emergency service because the police were chasing phantom alarms at the dealership. This was back in the mid 90's. The police knew the reason for the alarms but they still had to investigate the call.
There was a local CB operator that was causing interference to the Fire Department because he was running a very dirty amp and a splatter tuned radio.
It took years, really years to get action on him to try to stop it.
His name was Ira Jones, you can find his enforcement action file in the FCC database if you search.
( see PDF file below)
He Never allowed the FCC to inspect his station, even with local police, and FCC field agents in his front yard.
The police department admitted to the field agents that they could not force there way into his house without a warrant.
The fire Department replaced there equipment and solved the problem.
The FCC issued a NAL and tried to fine him $7000.
He Never paid it, and continued to talk on the radio.
He passed away a few years ago, still raising hate and discontent up untill his last days and never paid the fine.
If US Marshals and the FCC showed at your house over interference complaints, you are a very rare case indeed.
Usually they get a bunch of complaints, they send a couple field agents out to find the offending station from the local field office.
Once they track you down
they hand you a letter ( usually a notice of unlicensed operation) to inform you of the problem and put you on notice that if you do not correct the issues you could be monetarily liable and have to pay a fine for violating the communications act
and demand inspection of your station.
They will verbally tell you what you are doing wrong and if you don't stop they will Issue you NAL.
Most reasonable people at this point go " oh crap" and stop.
In my lifetime I have seen one enforcement case that involved US Marshals and it happened after years of complaints.
I was involved with that action because I was part of the local CB club.
Before the FCC even issued a NAL it got so far out of hand other things happened.
Sheriffs were called.
People got shot at.
People went to jail for stupid decisions.
He finally went away on federal charges not related to his radio conduct.
It was a mess.
After the FCC almost gave up on CB enforcement and Clinton signed the bill to allow local jurisdiction to pass and enforce on a local level interference problems FCC actions on the CB band almost became non existent.
Now, ham radio sees more FCC activity that CB does because hams record, report, badger and complain so much that they get tired and take action.
And it takes years for them to really do something.
Now that I have posted all of this, yes they do still take enforcement actions, but you have to be a real big ass on the air to get the attention of the enforcement team now, even more so since Ranger and the FCC went to Court and they got slapped real hard by a federal judge.
One internet search for " export radios for sale" will show you how much they care about CB rules.
I don't think you have a whole lot to worry about.
You are to be commended for trying to do it legal, we all have our own personal choices to make.