Required To carry an Irish passport When in Northern Ireland????

I believe you've asked this question before.

No birth certificate?

Why the hestitancy to apply for a Swiss or Irish passport? A first time Irish application takes about 20 days to process. If you had done it the last time you asked the question, you would have had it already and problem solved.

There are now spot checks along the border region. Some proof of citizenship will have to be provided.

There's something you're not telling us here. It's not that difficult or expensive to get an Irish passport, so what's stopping you? Why the aversion to getting one?

Like the answer to your previous query on basically the same subject - just renew your Irish passport. They're cheap by international standards and will remove the UK ETA entirely.

Your edge case is so, so utterly obscure that it is never going to be handled

Irish citizens do not need a passport to travel in the CTA. That's not going to change.

How you prove your an Irish citizen is up to you. Probably easiest just to have a passport.

As for applying for a passport, like pretty much everyone over here I have no intention of spending the time and money in order to go to one corner of one country in Europe for a few days.

By your own admission, you would like to travel using your Swiss ID so your Irish citizenship not relevant in this situation. As you are excersing your right to travel as a Swiss national, you need to spend the time and money to get a time-limited ETA, like the citizens of every other EU member state.

But sure that's an easy fix. And realistically, when does a citizen of a country get stopped in their own country and have to prove their citizenship? Not in Ireland definitely.

Just stay where you are. Switzerland's problem then thankfully.

What a strange hill to die on

You are correct, people don't understand how this is a big issue since it has an easy and obvious remedy - get an Irish passport or a swiss one.

In any case, even if you crossed the border the chances of being stopped and asked for your papers are vanishingly small. And even if they did bring you in, the matter would be cleared up quickly.

How does he prove he's an Irish citizen?

Please explain that before throwing out the glib, useless line again.

Except when a moment comes that he does. And all he can show is that he's Swiss. Swiss travel documents, Swiss address, presumably Swiss driving licence etc etc

Glib useless replies don't ever deal with reality, and you're digging down on a glib useless reply here.

You know that there are ID checks on cross border buses/trains frequently and a snooty "I don't have to, actually…" doesn't actually work? Add in other times when proof of ID may be required.

You're basically telling someone to go potentially get arrested, because notionally they don't need the paperwork they can easily and cheaply get.

You'll have a driving licence, which can be used to either infer citizenship (place of birth) or otherwise find out further info. If you don't have your licence on you, you will be arrested for driving without one - no produce 14 days later.

The OP only has Swiss docs.

If you are asked for documentation and don't have any, there is absolutely zero chance that "well, actually, I don't need any…" will stop you spending a night (or more) in the cells until proof can be found.

Telling people to just go for it and not have any proof is incredibly stupid and irresponsible.