Faceanti-spoofingiscrucialtopreventfacerecognitionsystemsfromasecuritybreach.Previousdeeplearningap-proachesformulatefaceanti-spoofingasabinaryclassifi-cationproblem.Manyofthemstruggletograspadequatespoofingcuesandgeneralizepoorly.Inthispaper,wear-guetheimportanceofauxiliarysupervisio