1. A device comprising: a measuring device for measuring a state of intoxication of a test subject and for generating a corresponding measured value; a camera for recording an image including a face of the test subject; a control unit configured to store the measured value together with the image in a memory unit; and an analyzer configured to analyze the image to determine whether it is possible to identify that a face is present in the image and to trigger a follow-up action by the analyzer when the determination is made that an identification of the presence of a face in the image is not possible and the analyzer is configured to determine a no face present error associated with the not possible identification of the presence of a face in the image and to store the no face present determined error in the memory unit or the analyzer or in both the memory unit and the analyzer.