#$%^&*AU2007231775B220120816.pdf#####ABSTRACT A breath alcohol-measuring device is provided, which includes a mouthpiece which can be inserted or attached, with a blow-in opening and with a blow-out 5 opening and with a hole for breathing gas sampling in the breath alcoholmeasuring device. The breath alcohol-measuring device (2) is equipped with a radiation source (3) and with a light guide (4) receiving the radiation of the radiation source (3). The light guide (4) is arranged extending from the housing of the breath alcohol-measuring device (2) up to the blow-out opening of the 10 mouthpiece (1) such that the light guide (4) acts as an illuminating means for the mouthpiece (1).low 2 Fig.I
