Attorney John Calcagni  breaks down in great detail those 3 infamous letters we all know as DUI. " Driving under the Influence" 

John L. Calcagni, III, is a prominent Rhode Island criminal defense attorney with extensive experience as a former military prosecutor (JAG Corps) and Special Assistant U.S. Attorney, specializing in federal, state, and military cases, including violent crimes, drug offenses, sex crimes, and white-collar cases, leveraging his prosecution background for defense in state and federal courts. He holds a Juris Doctor from Roger Williams University Law School, is admitted to practice in multiple states and federal courts, including the U.S. Supreme Court, and is recognized as a SuperLawyer.