I think the aim is to encourage people to excercise self-control with regard to alcohol consumption and if in doubt about their limit then use the personal tester as a check.
My thoughts are... if you use the tester and are deemed fit to drive, do you then get stopped and cop a fine for not having an unused breath tester in your glove box ?
As of September all Hertz rentals will be supplied with one and Hertz recommend that a further tester is purchased in case the driver uses one, which suggests to me that an unused one must always be available in the vehicle.
Bloody Frogs !! :
