PUZZLE 124 Caught Four Speeding

There's a line of five cars driving along the road, and they are all breaking the speed limit.
The next day, the five drivers go to the police station, but only four of them are charged with speeding.
Which car was the one that was being driven by the person who was not charged?

Hint 1

All five people were driving over the speed limit, so what could be the reason why just one of them wasn't charged?
If you can figure out the reason, you can also figure out which position they were in.

Hint 2

There is a reason why one of the drivers would not be charged with speeding even if they were over the speed limit.
What could that reason be?

Hint 3

Four of the drivers were caught by the police.
They were arrested for speeding.
Who could have arrested the four of them?

Super Hint

The five cars were driving along with a police officer chasing after the speeding cars.
Where would the police car have been?

Answer for 'Caught Four Speeding'

The answer is '5'.