IMost often, if you are driving through a DUI roadblock, and you are chosen, you will be signaled or flagged down to pull your vehicle over for a random check. A law enforcement official will ask you for your vehicle registration and driver's license. At this time, you may also be asked questions such as, “where are you coming from?” And also, “where are you going?” The cop will closely pay attention to you and look for signs of intoxication.
If signs of intoxication are observed, then the cop will suspect you are above the legal limit and order you to exit your car. You then will probably be given roadside tests, or be asked to breathe into a breathalyzer. When the results of these test are poor, you will be placed under arrest and escorted to the police station.
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When you are taken to a police station, you may then be asked to submit to a chemical test of your breath, blood, and/or urine.
However, keep in mind that laws for DUI roadblock procedures vary by state.