Periodically, the police set up DUI checkpoints but there are rules and regulations that they must follow. In addition a notice must be published in a local newspaper the day before. The rules require the police to follow certain guidelines. For example the police can’t pick and choose who they want to stop. It has to be done in a certain way, like every fifth car in order to be fair and random. Most importantly for you, there has to be an area where before you drive into the chute, where they direct all the cars, for you to make a last minute u-turn if you wish to avoid being stopped.