The given reason for being pulled over is something petty like following too close or not signaling at the right time. The real reason is the vehicle was flagged from some pattern determined by the ALPR networks.

I've had my car searched (I finally gave consent to search after over an hour of being detained waiting on a drug dog) because of a popular 'reasonably suspicious' pattern cops use. The loser let me off with a warning for speeding after finding nothing.