The driving force was beneath the impact: Proof ought to demonstrate the motive force was impaired, typically via a blood alcohol concentration (BAC) of 0.08% or better or evidence of drug impairment. Criminal rules differ from point out to condition, as do legal punishments, but felonies carry a weighty penalty: https://dui-lawyers.usattorneys.com/general-manger-of-des-moines-auto-dealership-arrested-twice-in-24-hours-for-dui-related-offenses/