It's for medical school in Norway
Well, perhaps it's not such a bad idea. People who want to harm the vulnerable do seek out opportunities where they can do so. On the other hand, Dr. Harold Shipman had an excellent reputation in his town and no police record, so the check is just a partially useful filter.
Shop around for translators. If you need a notarized version of a Polish police document in English, be sure to check it yourself before you pay.