William Pelarenos is a nationally recognized DUI expert witness who has testified as an expert witness in trials across Illinois as well as the State of West Virginia and the Commonwealth of the Northern Marianna Islands. His police training, education and experience in the DUI field has led to certification as an expert witness and award winning DUI enforcement tactics. He has also been authorized to teach CLE – Continuing Legal Education classes in DUI Detection and Breathalyzer Machines.

This comprehensive and concisely written volume creates a template for DUI enforcement and evaluation of DUI arrests for the police officer, the police supervisor, the breath analysis operator, the prosecutor, and the defense attorney. This book accompanies the DUI seminars of William Pelarenos, a retired police officer, a state-certified breath analysis operator, and a state-certified standardized field sobriety testing instructor. The seminars are based on police experience, certified training, and trial experience.

During his twenty-six-year tenure with the Cook County Sheriff’s Police Department, he made over nine hundred DUI arrests and testified in hundreds of cases including summary suspension hearings, bench trials, jury trials, grand jury testimony, and depositions. During the last five years of his career, he was part of a three-man Cook County–wide DUI enforcement unit that effected arrests throughout 21 townships, 132 suburbs, and the city of Chicago. He was called out to investigate DUI-related traffic crashes. He taught standardized field sobriety testing and DUI enforcement to hundreds of police officers from suburban police departments, Cook County Sheriff’s Police Department, Chicago Police Department, and state troopers from the Illinois State Police.