The first presents guidelines for questioning the examining officer concerning evidenced based on observations of the driver's driving, and physical appearance and conduct, performance of a field sobreity test, and incriminating statements. The second discusses case law covering prior conviction and enhanced-arrest issues, breath alcohol measuring devices, and the possibilities for error in breathalyzer testing. Strategies for defending driving-under the influence (DUI) cases, including pretrial motions, jury selection, and appeal procedures then are discussed and illustrated in case examples. In addition, research on the validity of breathalyzer testing is presented. The final three papers examine the DUI laws in Wisconsin, Minnesota, and North Dakota in terms of their implications for defending DUI cases. Monographs accompanied by footnotes and appendixes.