'Por la jeta' is a colloquial phrase that means free. In fact, jeta is collected in the Dictionary of the Royal Spanish Academy and is a synonym of face. So having a lot of fashion is fashionable and is the fault of the 'smartphones, specifically Apple and its FaceID, which to date seemed incorruptible. But no. Nor can all the credit be credited to the engineers of the Cupertino giant. Already in the sixties were born the first systems that recognized faces and that today we know as facial biometrics, which is what the great technology announced with pomp and fanfare in recent months. These early systems were capable of capturing features of the face such as eyes, ears, nose or even mouth. Due to the poor advances in this field in those years, the device was only able to take a small reference and compare it with a given pattern. This was the basis to begin to plant the pillars of facial biometrics and build a safety environment. With the new millennium, technological...