This is the first ever detailed analysis of what is the most widespread way in which Facial Recognition is used in public (& private) spaces: to authorise access to a place or to a service. The 3rd Report in our #MAPFRE series should be of great interest to lawyers interested in data protection; AI ethics specialists; the private sector; data controllers; DPAs and the EDPB; policymakers; and the general public, who will find here an accessible way to understand all these issues.