Drunk driving check points are set up by law enforcement agencies on certain roads around a city to stop drivers and screen them for driving under the influence of alcohol or drugs. Police look for things such as slurred speech, glassy eyes or other symptoms of intoxication. If the police officer suspects you have been drinking, the officer will ask you to get out of your car and perform a field sobriety test. Drivers who refuse to perform the field sobriety test or those that fail the test will likely be taken to the local jail for a chemical test to determine their blood alcohol level. Drunk driving check points have been a controversial subject for many years. Some argue they amount to an unreasonable search and seizure, but the Supreme Court has ruled the need to reduce drunk driving accidents more than justifies the inconvenience of a check point. Police agencies often give advance notice of drunk driving check points, listing the location of each check point and the date and hours they will be in effect.