This is the problem along with the parent's comments. They literally are a different class of citizen. Does anybody actually think another cop would see this and write the state trooper a ticket? That the state trooper would have to go to his courthouse and pay a fine? It doesn't happen.
At most, he'd be asked to move it. But until then he gets privileges us lower citizens don't have.
None if this is legal advice, and quite likely not all of of it would work. It's possiblpe that someone who thinks so little of obeying the law would be willing to hassle you personally constantly for such behavior.
Most of these ideas would be stupid, ineffective, or perhaps illegal, but my point is that you might indeed be able to creatively find a way to make sure that the trooper's illegal actions (off duty!)
- Gather evidence. Take pictures every day that he does it.
- Ask him nicely to park legally. Point out that his flagrant disregard for the law erodes everyone's respect for his profession.
- Ask your local police to ticket him personally. They might not do it, but it can't hurt to ask.
- Write to his boss. Write to the governor, call everyone up his chain of command. Point out the respect erosion issue, and ask that police be held to the same laws that they enforce.
- Sue him on behalf of citizens of the city when you see him doing it. I'm sure judges would feel really happy about police officers who flaunt the law for personal benefit.
- Campaign for a local (city/county) law that allows citizens to enforce parking laws (citations, towing, car boot) on any government-owned vehicle that is parked illegally. Make this your public example. (Of course, good luck actually doing that, but the media publicity might shame him?)
- If the place he parks is a "no parking" area due to things like fire hydrants, consider talking to the local fire department.
- Try to alert an impersonal bureaucracy that will treat his illegal parking as something tow-able or otherwise something they can escalate as part of their job.
- Call or write his boss every time you see him do it. Report it by vehicle number.
- Buy two extremely beat up cars and park them on both sides of his vehicle. (That might not be legal, now that I think about it.)
- Propose a local ordinance to give you permission to install a concrete or otherwise similarly heavy / ugly public art work directly next to his car in such a way that it shames him, or makes it really inconvenient to park there.
At most, he'd be asked to move it. But until then he gets privileges us lower citizens don't have.