Article 16 (Scope and interpretation of fundamental rights) (1) The fundamental rights enshrined in the Constitution shall not exclude any other set out in applicable international laws and legal rules. (2) The constitutional precepts concerning fundamental rights must be interpreted and completed in harmony with the Universal Declaration of Human Rights. Article 18 (Legal force) (1) The constitutional precepts with regard to rights, freedoms and guarantees are directly applicable and are binding on public and private entities. (2) The law may only restrict rights, freedoms and guarantees in cases expressly provided for in the Constitution, and such restrictions must be limited to those needed to safeguard other constitutionally protected rights and interests. (3). Laws that restrict rights, freedoms and guarantees must have a general and abstract nature and may not have a retroactive effect or reduce the extent or scope of the essential content of the constitutional precepts.