The functions of a court and the rules and procedures which it must follow when hearing a case must be defined by law.
The court examining your case must be established by law. This means that a law has been enacted, which explains how the court is to function and the rules and procedures, which it must follow when hearing a case.
Establishment by law guarantees that the court has been created and works under a law that is sufficiently clear and reliable, and that the court system cannot be easily changed and adapted to someone’s interests. This also guarantees that courts always follow pre-set rules and procedures when dealing with each individual case. Your case should not be heard by a court that has not been established by law.
The main laws covering criminal proceedings are the Law on Courts and Code of the Administrative Offences.