In most cases, if the other driver was drunk, the responding officer will notice, investigate, and arrest them for DUI or felony DUI.nnFelony DUI charges are investigated and prosecuted vigorously – if the drunk driver has been charged with DUI or felony DUI, your attorney on the Axelrod team will communicate with the solicitor’s office to stay abreast of any developments in the criminal case and keep you informed.nnAt trial, the defendant’s conviction for felony DUI is sufficient evidence to prove intoxication. If there is no conviction, however, we may still be able to prove substantial impairment through any tests that were conducted by law enforcement and through witness testimony.