In Maine the charge of OUI means Operating Under the Influence of intoxicants. Intoxicants means alcohol or drugs that can impair your ability to drive. This includes prescription drugs. Other states may call this DUI or DWI. OUI can be committed by either operating a motor vehicle, or attempting to operate a motor vehicle, if you are impaired to the slightest degree by alcohol or drugs, or if your blood or breath alcohol level is .08% or greater.