Fingerprints, photo, and maybe a few questions are part of the US entry process, as is an advanced ESTA form completion, now requiring a photo of your passport and details of your online presence. But this is for normal routes into the country not swimming across the Rio Grande from Mexico.
Every attempt to stop or hinder the boats across the Channel is met with objections; I believe at one time Border Force were confiscating mobile phones which would help identify individuals and maybe track back to the smuggling gangs, but this had to stop presumably because it breached the human rights of those making the crossing.
Someone else on the forum has already stated that if the passport is ‘lost’ at the point of arrival at an airport, then even though the departure airport will have the details of the passenger, they will not accept a return. No passport, no entry back.
Nobody wants these people.

hats off to palace, they were always gonna be louder, and hate to say it but they were impressive ALL bouncing and singing.

Not for British passport holders. We participate in the visa waiver program.

For the avoidance of doubt any comments in response to a previous post are directed to its ideas and not at any, or all, posters personally.

You’re assuming that the UKs increase is down to filling those vacancies; maybe they end up in the black economy, or in jobs that are created rather than filled ( think car park car washers etc.)

hats off to palace, they were always gonna be louder, and hate to say it but they were impressive ALL bouncing and singing.

No, my assumption was that millions of key workers aren't coming here. Those arriving aren't doctors and nurses or if they are then not enough of them are.

It’s 4 years since I was there and I don’t recall it. I remember having to complete the ESTA and know that some holders of non British passports have to provide biometrics before being granted a visa. I read though that all entrants, including US nationals now undergo electronic retinal and fingerprint scans so maybe I didn’t notice it. I associate fingerprints with ink pads and mess. (Yes, I was fingerprinted in the past. That’s another story.)

For the avoidance of doubt any comments in response to a previous post are directed to its ideas and not at any, or all, posters personally.

I think we are getting off topic. It was just a suggestion of mine we should get back to Gaza.

One more point