21.   After spotting the officers sitting in an unmarked car, two men ran away.

22.   But recently this attitude has changed, he said as he patrolled in an unmarked car around a neighborhood of battered brick homes and vacant lots in downtown Detroit.

23.   Chang parked his unmarked car on the stretch of road where the robbery had taken place and opened the hood, feigning engine trouble.

24.   Further complicating the logistical problems, O.J. Simpson accompanied the tour, riding along in an unmarked car, officials said.

25.   Half of the entourage, including three cars flanking the unmarked car carrying Simpson, ferried policemen.

26.   He and the three other officers, in an unmarked car and plain clothes, stopped and got out of the car, with Carroll leading the way.

27.   He recalled a time last November in Queens when three plainclothes officers descended upon him from an unmarked car and frisked him, saying they were looking for guns.

28.   He was stopped by four men in an unmarked car who dragged him away.

29.   In Dallas, unmarked cars are the chief weapon against lawlessness.

30.   Law was driven to and from the Suffolk County Courthouse by Boston police in an unmarked car because of threats against the cardinal, according to a police spokeswoman.