When major purchases of raw goods are made to turn into natural supplements, this type of technology is employed. For example, 100 pounds of echinacea; ok, you weigh it. How do you know it's the genuine article? By the detailed spectrum of light it gives off, detectable only by highly specialized and sensitive equipment, that can detect something like a candle from 5 miles away.
The ramifications of this are fascinating, as is the relationship between DNA and light. I think God knew what He was doing, and hid it right under our noses. I think He just wants us to stop and look ...