What happen to the evidence after the conviction of a certain person?

After a conviction, the evidence in a case is typically retained for a specified period, often dictated by legal statutes or regulations. It may be stored securely by law enforcement or the court system in case of appeals or future legal proceedings. If the conviction is upheld, the evidence may eventually be destroyed or returned to its rightful owner, depending on the nature of the evidence and jurisdictional rules. In some cases, evidence is preserved for potential exoneration if new information or technology emerges.