First of all, when victims file a complaint, they can provide as much information and evidence as possible to the judicial police.
During the investigations, the police or the Public Prosecutor may ask victims to return to the scene or to add additional details that they may have overlooked when filing the complaint.
During the trial, victims will be able to testify, i.e. to explain verbally what they have suffered and experienced, and to answer the questions put to them.
Victims who have registered as a civil party can therefore influence their own trial because they are fully a part of it: they have the right to be heard at the different stages of the procedure, to consult the case file, provide information that may be required for the investigations, and help uncover evidence.
In addition, the competent authorities can ask any victim, even if they are not a civil party, to provide more details if they need further clarification of the facts.