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obviously to legally protect itself (should a drone owner(russia) cry foul of a bad shoot/damage/declaration of war..) poland would need to have done some kind of investigation to declare good reason to shoot it down. EG it came within polish borders.. if poland said it was 100km away from poland, russia could call it a message from poland declaring war on russia.. which would be a bad case to initiate
Why would they need to legally protect themselves? Russia denied sending them, so why would Russia even mind? And which court you think would defend individual doing this?
But Russia already attacked Poland's Embassy in Kyiv, so this seems like a pattern where they are testing how Poland responds.
Which means that best response should be quick and swift. Otherwise Russia will just up their stakes and see where their line is, like a child testing boundaries.