A remarkably accurate and reliable method is examining the heat map of the face. The thermogram is produced by a heat camera and analyzed by a sample identifying algorithm, which checks the relative heat differences.

Because the high cost of heat cameras this method is rather expensive, and also quite reagent to external heat sources.

A huge benefit however is that this system works perfectly even in complete darkness, and because of the discrete pattern of blood vessels the recorded thermogram is very unique.

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