We spectroscopically investigate the impact of alcohol intake on the blood-pulse waveform and confirm that alcohol intake can be discerned by opto-electronic sensors. This paper focuses on specific spectra in the blood-pulse waveform and demonstrates the importance of observing the harmonics ratio of the blood-pulse waveform. In contrast to past studies, it is strongly suggested that the best light source for detecting alcohol intake is a green-LED. An analysis of the time evolution of the harmonic ratio shows that it includes important information from which the intake of alcohol can be discerned despite the complexity involved. This analysis is verified by mathematical modeling.
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