Evidence is anything that tends to prove or disprove a material or relevant fact alleged in a lawsuit or other legal proceeding. Witness testimony, documents, contracts, email messages, photographs, medical bills, video images, and voice recordings are common pieces of evidence.
In Oklahoma, evidence is regulated by both state statutes and rules of court, particularly the Oklahoma Evidence Code, which is similar to the Federal Rules of Evidence. Evidence must be relevant to the facts of the case, meaning it should have any tendency to make a fact more or less probable than it would be without the evidence. This includes witness testimony, documents, contracts, email messages, photographs, medical bills, video images, and voice recordings. The admissibility of evidence is subject to the discretion of the court and must conform to legal standards, including the rules against hearsay (statements made outside of the court), unless an exception applies. Additionally, evidence must be authenticated or identified as genuine before it can be admitted, and its probative value must not be substantially outweighed by the risk of unfair prejudice, confusion of the issues, or misleading the jury.