A 4th DUI charge within how many years? Is this a potential felony or just a misdemeanor charge? Was there any alcohol involved or was it drugs/medication that caused the cops to believe your friend was OVI? More info is needed to accurately answer your question.
Your friend should contact attorney Jon Saia or Rob Calesaric to discuss the specific facts.
Two years on a Misdemeanor, six years on a felony. Better have your friend consult an experienced OVI lawyer in your local area immediately, before they come knocking on his door to arrest him.
Dan J. Weisenburger
Attorney at Law