Handheld meters require an occasional calibration....is there a plan for that?  Here in Iowa, on your second DUI, you get one of these attached to your ignition switch, and you are require to blow in it to start the car.  I arrested a guy once that was driving with one of these, and I asked him how he did that, and he said the he had his sober passenger blow into it....I asked him why he didn't just let him drive, and he said that he didn't trust him with his car.......pretty sure there was never a chance he was going to work for NASA.

Mike