Article 87 of the Constitution of the Republic of Poland mentions – among the universally binding legislation – also ratifi ed international conventions/agreements. It means that these con- ventions/agreements form a part of the domestic legal order and have precedence over national laws in the event of potential collision with these laws, if they have been ratifi ed upon prior consent granted by the Act of Parliament (Article 91 of the Constitution of the Republic of Poland). Since 1 May 2004, that is from the day of Poland’s accession to the European Union, the EU legal acts, and fi rst of.