Illinois DUI lawyers are often asked about statutes of limitations. A statute of limitations restricts the time in which the state can charge you. In that connection, there are two separate but related issues.
If you are accused of a misdemeanor (fewer than three previous DUI offenses), the state has 18 months from the date the offense was allegedly committed in which to file charges against you. If you have more than two previous DUI offenses, you may have committed a felony DUI. In that case, the state has 3 years from the date the alleged offense was committed in which to bring charges.
Once charges are filed against you, the statute of limitations has been satisfied. Therefore, if you skip out on court, the state can prosecute you for that DUI years later and not run afoul of the statute of limitations.