I do not want him at my house do they check the foreigner
If you are legal in poland then there is not a problem, it is common for us to be stopped and questioned from time to time especially late at night, I find it comforting that people are watching and keeping an eye out for criminals, illegals and drunk drivers.
But the straz granicza do not fool around I live in a border area where migrants sometimes enter to do cheap shopping or fuel, the border guards are known to give illegals a good thrashing (no papers to show connection to poland) before driving them to a remote mountain border post and throwing them out of the van to fend for themselves in deep snow and freezing temperatures.