Were those all state trooper cars with the light bars on top? Or did you notice the "other" unmarked vehicles like the big SUVs, the new Chevy sedans, and the ever intriguing mustangs.
It's enough to drive you wild.
I've tailgated one of the Chevy's thinking it was just someone else and then they flashed the lights and I backed off. The other one saw me in the middle of a road rage with the car in front of me and when I jumped behind him he flashed his lights until I backed off.
You can't identify it because the lights in the back window are white bulbed until they turn them on. So it looks like your regular family car.
Luckily I was behind them and stayed behind them until they went wherever. I haven't done that since.