Breath Testing with Steven Epstein The 90-minute presentation will cover the fundamental principles and scientific concepts that provide the basis for breath testing to determine blood alcohol concentration. Steven Epstein Mr. Epstein is a founding partner at Barket Epstein Kearon Aldea & LoTurco, LLP and head of the firm’s DWI and Vehicular Crimes group. Mr. Epstein is Head of the Steven Epstein DWI Defense Institute, an educational program designed to teach lawyers how to defend DWI cases. Mr. Epstein has more than 28 years of experience in the field of criminal defense and has tried well over 100 DWI cases to verdict.