Dr. Declan Bedford:

There have been many advances in technology and it may be the case in the future but I do not know if there have been any major trials in big populations. I believe that they have only been tried with people who have problems. There is obviously an expense associated with them as well. Random breath tests and that sort of thing are supposed to be a deterrent to stop people from drink-driving in the first place. They are not designed to catch people. I read an article many years ago about a young police officer in Australia who was taken out to his first random breath test check point. He came back that night and had not caught anybody, and was very disappointed until a senior officer told him that that was a good night and that their job was to stop people by letting them know that the police were present, which stopped them from drinking and driving. I believe in highly visible enforcement.