This Chicago DUI lawyer has posted here, here, and here about the increasing penalties for DUI offenders. Did you know that the penalties even increase based on the amount of alcohol in one's breath or blood at the time of the offense?
A person who violates subsection (a) a first time, if the alcohol concentration in his or her blood, breath, or urine was 0.16 or more based on the definition of blood, breath, or urine units in Section 11‑501.2, shall be subject, in addition to any other penalty that may be imposed, to a mandatory minimum of 100 hours of community service and a mandatory minimum fine of $500.
Did you notice that the penalty is for a first-time offender? There's no comparable penalty for a DUI without blood, breath, or urine units for a first time offender equally situated. The additional penalty is solely for cooperating with the police and submitting to those tests.