I am a lawyer with a criminal law and drunk driving defence practice in the Greater Toronto Area. I was called to the Ontario Bar in 1979. Since that time I have prosecuted and defended a great number of impaired driving and over 80 charges. I have a special interest in forensic science as it relates to approved instrument breath testing. I own both evidentiary instruments and screening devices. I present tutorials for defence attorneys at my office in Mississauga, and elsewhere in Ontario and Quebec. I have presented at Law Society of Upper Canada and other Bar association seminars in Ontario and at a conference in the United States. I know what technical defences are likely to be successful and which ones are not likely to result in acquittal. Most importantly, I have a very good understanding of the limitations of these instruments. I know when they are likely to make mistakes. They are not infallible.