It is a common myth.
I recall once being on a freeway in a marked PD unit and being passed by a guy doing more than 100 MPH. I sped up to catch him, got behind him and hit my lights ... he kept yielding to the right and trying to wave me around him for about 3 miles until he finally yielded to the right side of the freeway. Upon contact, the first words out of his mouth were, "You can't stop me, you're not the Highway Patrol, you have no jurisdiction here!" I advised him that if he was right, he'd have no trouble gaining an acquittal.
When I returned, I asked him to sign the citation, "Press hard, three copies." He noted that the court assigned was from MY part of the county which was more than an hour and a half from where he lived, and he complained that I could not cite him there, either. I informed him of the inter-county MOU and suggested he could seek a change of venue to his local court (which would have been massive overtime for me - door-to-door, plus two hours court minimum, would have been 5 hours or so). Fascinating, I never saw him at court. He plead guilty and paid his fines and did traffic school.
- Carl

