The offense of Driving Under the Influence (DUI, which is the same as DWI or Drunk Driving but the legal term is DUI) most often involves alcohol. However, under Illinois DUI law, it also covers other offenses.
The standard and classic DUI involves being in actual physical control of a motor vehicle while under the influence of alcohol. Grounds for an arrest may include evidence of bad driving, poor balance and coordination, substandard performance on standardized field sobriety tests and other general observations of the police officer, such as slurred speech and bloodshot eyes.
A second type of alcohol-related DUI offense involves what are known as “per se” charges. This is a Latin phrase that essential means “automatic”.
The prosecutor may lack the evidence needed to convict you of DUI under the situations described above. However, the per se law says it is also DUI for you to drive with a blood alcohol level (BAL) of 08% or more. This charge can be proven by blood or breath tests, both of which are known as “chemical tests”.
Chemical tests are different from the preliminary breath test (PBT) . The PTB is administered in connection with the process that involves determining whether or not you are going to be arrested for DUI.