To identify an individual, @tahkion explained, facial recognition software relies on "landmarks" on the human face. The key to the deception lies in the face paint on the front of the juggalo's chin: it boosts the contrast, causing facial recognition tech to miss where the jawline begins and ends. To match with a make-up picture already in a database, the two face paint styles would have to be exactly the same. Other forms of make up, like the corpse paint associated with black metal, won't trick the computers.