Does the prosecution have to submit all evidence to the defense before a trail?

Yes, in most legal systems, the prosecution is required to disclose all evidence that may be favorable to the defense before trial, a principle known as "discovery." This includes both evidence that supports the prosecution's case and any exculpatory evidence that could help the defense. However, there may be exceptions or specific rules governing the timing and extent of this disclosure, which can vary by jurisdiction. Overall, the goal is to ensure a fair trial by allowing both sides to prepare adequately.