Illinois DUI law provides law enforcement with several different means of demanding blood tests to determine the presence of alcohol or other drugs, including prescription medication, in drivers. These provisions rely upon the concept of ‘implied consent”. In other words, when you choose to operate a motor vehicle upon the public roadways of Illinois, you have indirectly given your consent to be subjected to these tests if certain conditions exist. 625 ILCS 5/11-500 et. seq.
In any DUI arrest situation, the police have the choice to ask you to submit to a blood test. Because of the time and expense involved, if the arresting authorities believe that the cause of your alleged intoxication is alcohol and if there was no accident requiring immediate medical treatment, most likely they will rely upon a breath, rather than blood, test. The results of breath tests are ordinarily immediately available.
On the other hand, not all DUI charges require proof of actual impairment from alcohol, other drugs or prescription medication, or proof that your blood alcohol level (BAL) exceeds .08. These so-called “per se” violations require the police to show that ANY amount of a banned substance is still in your system, even if the amount detected was not enough to impair your driving ability.
Breath tests will not detect drugs. Urine tests will not detect the very small quantities that police may suspect. Proof normally requires a blood test. Absent an accident, you are entitled to refuse to submit to such tests.