I don't know the specifics, but you always have to declare the equivalent of felonies, but for misdemeanours you can lawfully not declare them after some period of time in which your debt is considered repaid and the record spent.
The whole of the EU has such laws. I think most people within the EU would regard this as just a part of living in the civilised west.
And the most simple part of that is that if you arrested and never charged, or even charged but acquitted during trial, or even arrested and cautioned... then you never need to declare it. You can quite literally forget about it after some relatively short period of time, I think it's a year or 3.
Going back to my brother. Never charged, never cautioned, never went to trial, released without any impact whatsoever... just a bad day, worth forgetting and after 20 years definitely forgotten.
I think almost everyone I know would've said no to the question quite honestly believing that it's a perfectly reasonable and honest answer.