Researchers at the University of Copenhagen have modified a baker's yeast cell and replaced it with a sex drive that causes the cell to turn red when it detects cannabis. This modification can detect not only cannabis, but molecules with similar functions to cannabinoids. Humans use GCPRs (G-Protein Coupled Receptors in order to taste and smell. The researchers of this study used these same receptors in order to create the signal.
In a singe day of testing this receptor, researchers found four new substances that had not been discovered, but could potentially be used for anti inflammatory purposes or pain relief.
I am interested to see how this study develops, it seems like the sensor detects so many different substances that it might not be useful for testing for cannabinoids, but I think it could potentially help detect alternate uses in different substances.