That was just an example of such a line since I know only Polish constitution. I know that everything legal is open to really wide and crazy interpretations al

That was just an example of such a line since I know only Polish constitution. I know that everything legal is open to really wide and crazy interpretations already but if there weren't such a line to interpret there would be no chance for an anti-scanning interpretation. It could also end up being limited to foreigners since the line protects citizens specifically. It depends what do you mean by biometrics database, i.e.: Polish passports are 'biometric' and have two index fingerprints stored in them for a few years now. I have no idea if the passport database is accessible to police or if there is any face scanning going on. I'd say the foot in the door is airports themselves. You already need a passport or ID there so the face scan is literally no new information and only confirming what the papers say. The real creepy tech to me is mass country wide face scanning to track everyone everywhere 24/7 and see what they do, who they associate with, etc. and possible future airport brain scans (like MRI to detect positive or negative emotions in response to a country flag or a picture of state head for example).