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each species of molecules in the body can generate a different set of colors of light when stimulated with a laser beam.
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This is called fluorescence. If you have anything in your body with this property I would say you're poisoned. What they probably mean is absorbtion of light. Your skin color can become visibly orange/yellow if you drink enough orange juice, so I guess it's possible to determine carotene content by analyzing absorbtion spectra.