" It does, sort of. You cannot be obliged to incriminate family members, for instance. In terms of your personal affairs, you don't *have* to cooperate, but if you don't, it can cause problems for you later in court if you then present evidence that hasn't been presented before. I was a witness in one case where the defendant tried to produce evidence during my testimony, and the judge ruled it to be inadmissible as the defendant hadn't presented it at the start of the hearing that day. What was nice - the judge actually asked me if I wanted to accept the evidence if it would help my testimony. The evidence was totally irrelevant and had nothing to do with me as a witness, so there was no sense in accepting it.
If you're interested, it's because the US has the adversarial legal system where the judge/jury are neutral and decide cases on the basis of the presented facts, whereas the Polish (and in general, the Roman/Napoleonic) system is inquisitorial, so the judge is obliged to find out everything that they can. IMO, the Anglosphere system is much better as it relies much more on the prosecution building a case.
en.wikipedia.org/wiki/Inquisitorial_system explains it in more detail. In practice, there are major problems in Poland - the police are known for not giving people their right to a lawyer until they've been detained for quite a while, and the current practice is to write a lawyer's number on your arm or memorise it before attending demonstrations.
One thing I will say - the road police are very fair, and if you're pleasant and friendly towards them, they'll often use their discretion to give you a fine according to the lower level of the fine scale. I found a dog one night by the side of the road in the mountains, and by coincidence, they stopped me for a random check. When I asked them if they had any idea where to take the dog, they went and called their headquarters to find out for me."
are you retarded or brain dead?