A system for non-invasively measuring an analyte in a vehicle driver and controlling a vehicle based on a measurement of the analyte, the system comprising: a laser bar and a controller configured to calculate a measurement of the analyte in the tissue of the vehicle driver based on the light detected by the one or more optical detectors, determine whether the measurement of the analyte in the tissue of the vehicle driver exceeds a pre-determined value, and provide a signal to a device configured to control the vehicle characterized in that the laser bar comprises: a first plurality of solid-state light sources, wherein each of the solid-state light sources of the first plurality of solid-state light sources emit light at a first wavelength; a second plurality of solid-state light sources, wherein each of the solid-state light sources of the second plurality of solid-state light sources emit light at a second, different wavelength; the system further comprises: a first light-transmissive fiber for receiving and combining the light emitted by the first plurality of solid-state light sources so as to provide a first combined beam of light; a second light-transmissive fiber for receiving and combining the light emitted by the second plurality of solid-state light sources so as to provide a second combined beam of light; an optical cable for receiving and combining the first combined beam of light and the second combined beam of light so as to provide a third combined beam of light; a sample device configured to introduce the third combined beam of light emitted by the optical cable into tissue of the vehicle driver; one or more optical detectors configured to detect a portion of the third combined beam of light that is not absorbed by the tissue of the vehicle driver. a laser bar and a controller configured to calculate a measurement of the analyte in the tissue of the vehicle driver based on the light detected by the one or more optical detectors, determine whether the measurement of the analyte in the tissue of the vehicle driver exceeds a pre-determined value, and provide a signal to a device configured to control the vehicle characterized in that the laser bar comprises: a first plurality of solid-state light sources, wherein each of the solid-state light sources of the first plurality of solid-state light sources emit light at a first wavelength; a second plurality of solid-state light sources, wherein each of the solid-state light sources of the second plurality of solid-state light sources emit light at a second, different wavelength; a first plurality of solid-state light sources, wherein each of the solid-state light sources of the first plurality of solid-state light sources emit light at a first wavelength; a second plurality of solid-state light sources, wherein each of the solid-state light sources of the second plurality of solid-state light sources emit light at a second, different wavelength; the system further comprises: a first light-transmissive fiber for receiving and combining the light emitted by the first plurality of solid-state light sources so as to provide a first combined beam of light; a second light-transmissive fiber for receiving and combining the light emitted by the second plurality of solid-state light sources so as to provide a second combined beam of light; an optical cable for receiving and combining the first combined beam of light and the second combined beam of light so as to provide a third combined beam of light; a sample device configured to introduce the third combined beam of light emitted by the optical cable into tissue of the vehicle driver; one or more optical detectors configured to detect a portion of the third combined beam of light that is not absorbed by the tissue of the vehicle driver. a first light-transmissive fiber for receiving and combining the light emitted by the first plurality of solid-state light sources so as to provide a first combined beam of light; a second light-transmissive fiber for receiving and combining the light emitted by the second plurality of solid-state light sources so as to provide a second combined beam of light; an optical cable for receiving and combining the first combined beam of light and the second combined beam of light so as to provide a third combined beam of light; a sample device configured to introduce the third combined beam of light emitted by the optical cable into tissue of the vehicle driver; one or more optical detectors configured to detect a portion of the third combined beam of light that is not absorbed by the tissue of the vehicle driver.