Corrected entry: An air bag is shown to have deployed in Drebin's car after hitting some garbage cans. Air bags didn't become available in the Ford Crown Victoria until 1990 but the movie came out in 1988. Such a minor impact wouldn't have deployed the air bags anyway even if the car did actually have them.
Myridon
17th Jan 2005
Correction: Police cars sometimes have more safety features added to them that are not yet available on showroom model cars. Airbags obviously existed in 1988 and there is no reason that one could not be installed as it obviously was.
Myridon