In Illinois, it is just as illegal to drive under the influence of drugs as it is to drive under the influence of alcohol. You should be aware that if you arrested for DUI and any trace of an illegal drug shows up in your system, that is evidence enough to charge and convict you. Some drugs linger in the system for some time after they are taken, but under Illinois law it doesn't matter how long ago the drugs were consumed or if you were still feeling the effects when you were arrested.

Legal drugs can also impair your ability to drive. It doesn't matter if they were prescribed to you or not-if they cause side effects such as dizziness, sleepiness, or blurred vision, you should not take them and drive. If you are prescribed a drug with these side effects, you need to take the prescription at home and find out how it affects you so you'll know whether or not it is safe for you to drive. You don't want to be behind the wheel when you find out that your new prescription makes you uncontrollably sleepy!