How do the authorities know whether someone reaches a country?

In Poland there are 10 days of quarantine for people arriving in Poland. Consider that someone arrives in Poland from Istanbul through Amsterdam. How do the officers know that he arrived in Poland, since the passport control was in the Netherlands and nobody checked the person when they entered Poland? Does KLM give the person's name to the police? Is this possible?
can somebody explain this to me. Since 23 January ... what does this mean? If I have a test 48 hours before entering poland then no quarantine is required? Right?
Best Answer
The formal entering of the Schengen area will be in your first airport within the area, as usual.
But special rules will allow Poland to check and record your details.
The airline may well give details, they usually do for some countries, although not within Schengen as far as I know.
If countries feel there is a need, COVID 19 rules do allow other measures like quarantaine in apointed locations.
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