What does the search light on a cop car mean?

The light on the drivers side replacing the side mirror is used for a more direct light source. for example if they were looking for something at night they would be better able to see what was going on. It doesn't mean anything, it's just another tool. A literal tool, not like the metaphorical tool sitting in the drivers seat. The light on the drivers side replacing the side mirror is used for a more direct light source. for example if they were looking for something at night they would be better able to see what was going on. It doesn't mean anything, it's just another tool. A literal tool, not like the metaphorical tool sitting in the drivers seat.