(a) Is under the influence of intoxicating liquor;

      (b) Has a concentration of alcohol of 0.08 or more in his or her blood or breath; or

      (c) Is found by measurement within 2 hours after driving or being in actual physical control of a vehicle to have a concentration of alcohol of 0.08 or more in his or her blood or breath, to drive or be in actual physical control of a vehicle on a highway or on premises to which the public has access.

      2.  It is unlawful for any person who:

      (a) Is under the influence of a controlled substance;

      (b) Is under the combined influence of intoxicating liquor and a controlled substance; or

      (c) Inhales, ingests, applies or otherwise uses any chemical, poison or organic solvent, or any compound or combination of any of these, to a degree which renders the person incapable of safely driving or exercising actual physical control of a vehicle, to drive or be in actual physical control of a vehicle on a highway or on premises to which the public has access. The fact that any person charged with a violation of this subsection is or has been entitled to use that drug under the laws of this State is not a defense against any charge of violating this subsection.

Prohibited Substances

It is unlawful for any person to drive or be in actual physical control of a vehicle on a highway or on premises to which the public has access with an amount of a prohibited substance in his or her blood or urine that is equal to or greater than:

                                                                                             Urine                        Blood
                                                                                             Nanograms              Nanograms

      Prohibited substance                                                     per milliliter             per milliliter

      (a) Amphetamine                                                                     500                               100

      (b) Cocaine                                                                               150                                50

      (c) Cocaine metabolite                                                             150                                50

      (d) Heroin                                                                               2,000                               50

      (e) Heroin metabolite:

             (1) Morphine                                                                   2,000                                 50

             (2) 6-monoacetyl morphine                                            10                                       10

      (f) Lysergic acid diethylamide                                               25                                       10

      (g) Marijuana                                                                         10                                       2

      (h) Marijuana metabolite                                                       15                                       5

      (i) Methamphetamine                                                            500                                   100

      (j) Phencyclidine                                                                     25                                    10