What characteristic must all evidence possess?

All evidence in a legal context must be admissible to be considered valid and usable in court proceedings. Admissibility refers to whether the evidence meets the legal standards and criteria set by the court system, such as relevance, reliability, and compliance with legal procedures. Without admissibility, evidence, regardless of its nature or strength, will not be allowed to influence the court's decision-making process.

While other characteristics such as being persuasive or documented can enhance evidence, they do not constitute a fundamental requirement for all evidence. For instance, evidence can be very persuasive without being admissible, and documentation is important but not always required. The extent of the evidence also does not determine its admissibility; quality and compliance with legal standards take precedence over quantity.