I do like the way you've casually dropped "ethinicity" into your reply,
You claimed that anyone who was "British" could prove they were.
Anyone who is actually British.
As I presented a scenario where someone couldn't prove their were British with any documents.
And as you used the description "British" I naturally wanted to know what you consider to be British.
As usual you've side-stepped explaining your idea of what is "British".

You have a habit of side-stepping probing or embarrassing questions.
You've failed to explain how AI will discern whether someone is British or not.
And you've failed to expalin what your idea of british is.
trying to line up for your inevitable cry of "racism" at some point.
There's been two references to racism in this thread so far, both by you.
they just scream "wacism!"
your inevitable cry of "racism" at some point.
Let me be super clear: Ethnicity does not come into it. If you read any of my posts on here, you will know that my main issue is with people here from the EU, regardless of any other characteristic.
Yeah????
"detention centre while your case is reviewed" malarky draining us of our taxes either.
How many EU immigrants are housed in Border force detention centres?

You're hop skipping about trying desperately to post a coherent argument.
We, all of us, leave a digital footprint, whether in the UK or - in the case of immigrants - in their country of origin.
You claim that everyone leaves a digital footprint.
AI assisted techniques such as facial recognition, speech and accent recognition, can all be used to find that digital footprint and ascertain status.
They won't find it if it doesn't exist. See above.
I do agree there will be limited circumstances where an individual does not have a suitable digital footprint
Up to 50% of them.

So a waste of resource looking for something that doesn't exist.
and at that stage the UK-ICE agent will need to make a risk assessment.
Assessing the risk to the individual, or from the individual?
Or do you mean the risk of getting it wrong and rounding British people?
Or do you mean they are assessing their application for asylum on the hoof?
It may be appropriate to leave the individual as is. There will be multiple and repeated sweeps so everyone will have the opportunity to prove their identity eventually -
Oh, so they'll be tested multiple times?
this is about asymptotically approaching 100% removal, not a one and done. Or, it may be necessary to escort them to a location where ID is available. And so on.
As you'll inevitably ask, in the above scenario I would expect ICE to do:
(1) Take photographs of the man and compare him to records on the facial recognition database.
(2) If we are in a scenario where there have been multiple previous contacts with refusal to provide proof of Britishness, remigrate.
To where?
(3) If this is a first contact scenario, escort them to a location where his documentation is available.
That's a circular process. Assess them as the first contact without ID, so escort them to where ID is available.
How did you assess them as first contact without ID?
Unlike many on the patriotic side of politics, I am for mandatory ID cards as a means to solve this problem. I understand the concerns but, ultimately, for the greater good. So, in tandem with all of the above, I would anticipate a programme where we will all be required to apply for mandatory ID as proof of Britishness. This will come with a mandatory carry-and-provide law. So, we will meet an inflexion point (say after 6-12 months) where no provide, no stay - simple as that. All of the above are interim measures until this kicks in.
You might then ask: Why not just wait for the ID cards? It's a good question. The answer is that government IT programmes have a history of over-running and the migration crisis is URGENT. We cannot wait and Rupert will need - quite rightly - to take interim action immediately he becomes PM.
Welcome to the autocracy of James Carmichael.

At what age would children be expected to carry ID cards?
Are these cards free, or paid for?
Who will assess the housebound, the care home residents, the long-term hospital patients, etc.?