You are aware, of course, that 'reasonable doubt' is only relevant in adversarial legal systems? Portugal's is an inquisitorial legal system.
"Portugal’s legal system is a civil law system.
As per civil proceedings, the Portuguese legal system should not be qualified as adversarial or inquisitorial. The civil procedure is based on the dispositive principle, which means that the parties are responsible for alleging the facts, gathering evidence and determining the nature of the evidence they choose to provide. The court’s role is primarily to conduct and oversee the proceedings to ensure that the evidence given is within the rules. It then weighs the evidence, according to pre-existing rules, to render its judgment. The court may, however, on its own initiative, request any evidence that it deems necessary to reach its decision, based on the facts lawfully acknowledged by it. Indeed, under Articles 411, 417, 452, 467 and 526 of the Civil Procedure Code (hereinafter “CPC”), the Court may call the parties to testify, order expert witnesses, call witnesses to testify and ask the parties or third parties to disclose documents or other evidence to support the facts. Witnesses’ testimonies are taken by the parties’ lawyers, but the parties’ testimony is taken by the judge.
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