The final judgment in your case must be based on evidence. The state institution must gather enough evidence to prove that you committed the offence with which you have been charged.
Evidence in your case may include material evidence, documents, all kinds of recordings, witness statements etc. The evidence presented to the court must be relevant to your case and should have been legally obtained. Any evidence obtained by torture or by threats to the life or health of you or any other person cannot be used in court.
You are also allowed to present your evidence and call your witnesses to court. You must be given an opportunity to present your evidence on equal conditions with the state institution.
Failure to observe these rules can violate your right to a fair trial.