There may be probable cause for arrest if you are operating a motor vehicle with a blood alcohol concentration (BAC) of 0.08% or more. If you are under the age of 21, that BAC is .02%. A BAC of .08% is equal to have 80 milligrams of alcohol per 100 milligrams of blood. Probable cause to arrest someone for DUI/OVI in Ohio exists when an arresting officer determines via sufficient information, such as the results of a field sobriety test, breathalyzers, walk and turn test, one-leg stand, that a person has been operating a vehicle under the influence of alcohol or a prescription drug that has impaired the ability of the individual. The operating of a vehicle with an odor of alcohol, coupled with other evidentiary support, may give rise to “probable cause”.