Bowing to pressure from lawmakers after a recent U.S. senate hearing, Apple has updated the review guidelines to sideline new apps that might be seen as aiding drunk drivers.
Section 22.8 of the updated App Store Review Guidelines reads:
Apps which contain DUI checkpoints that are not published by law enforcement agencies, or encourage and enable drunk driving, will be rejected.
Some of the apps in question are, however, still available in iTunes for download.