What rule is evidence not admissible?

Evidence may be deemed inadmissible under several rules, primarily the relevance rule, which states that evidence must be directly related to the case at hand. Additionally, evidence can be excluded if it violates rules against hearsay, is based on prejudicial material that outweighs probative value, or if it was obtained unlawfully, such as through an illegal search and seizure. Each jurisdiction may have specific rules and exceptions that further define admissibility.