The checkpoints for drunk drivers are set by the law enforcement agencies on certain roads around the city to stop drivers and sift them to know if they are driving under the influence of alcohol or drugs. Police pay attention to the mispronunciation, glassy eyes or other symptoms of poisoning.
If the police officer suspects that you have been drinking, you will be asked to leave the car and perform Field Sobriety Testing. If it passes, you can be released. Drivers who refuse to perform the field sobriety test, or not approved, will probably be taken to the local jail for a chemical to determine your level of blood alcohol test.
DUI check points have been a controversial subject for many years; some argue that constitute an unreasonable arrest and search, but the Supreme Court has ruled that the need to reduce drunk driving accidents, more than justify the inconvenience of a DUI check point. The police units often are notified in advance of the location of the checkpoints of drunk drivers, listing the location of each item and the date and times that will be in operation.