As for finding an unauthorized one, lots of interesting ideas here. If someone shows up to find out why it is not working, their arrest would be a good start. Police are obligated to uphold the law, and you can insist, if a law was actually broken.
That reminds me of an incident about 30 years ago, right after I had moved back here, and I was working in KY in a town just to the north. A co-worker who also lived in TN was in a hassle with the KY state IRS over KY income tax. We don't have state income tax in TN. He had quit the job, and the KY IRS people claimed he owed the state some tax money that his ex-employer had failed to withhold, something that he had disputed. One evening two KY IRS agents showed up at his doorstep. He told them to get lost, that they had no jurisdiction here, and that if they didn't exit his property immediately, he was going to call the police. They left, and he never heard from the KY IRS again.