Being up front (and out back) with my tags

My first clue was when I saw, in my rearview mirror, the Colorado Highway Patrol car make a U-turn.
At the moment, there wasn’t another vehicle visible on that stretch of road, so I assumed the trooper was either in a hurry to head back the other direction, or he was coming after me.
It was the latter.
Next thing I noticed was the trooper’s flashing lights, so I immediately pulled over.
You know how…