If they can't catch them they most likely won't pursue, this is pretty common with motorcycle crotch rocket riders but it applies in certain driving situations as well. Cop isn't gonna recklessly pursue you and potentially endanger others just to give you a ticket, especially if they weren't quick to draw. Kinda reasonable even though this is kinda the stuff that causes accidents. It would help if they did enforce the passing lane more against slow or camping drivers, it boggles my mind that people don't see an issue with a mile long line behind them and open road in front of them