Found this interesting: A single DUI conviction is not grounds to deny entry into the U.S; however, multiple DUI convictions or a DUI conviction in combination with other misdemeanor offenses can make you inadmissible and require a waiver prior to entering the United States. A crime of moral turpide (CIMT) may be grounds to deny entry to the U.S. Source: Admission to the U.S .with either a misdemeanor or criminal record