In the legal context, the burden of proof plays a critical role in the success of a case. It is the legal requirement to establish who is responsible for presenting evidence that proves or defeats a claim. It also determines how much evidence is needed to achieve that goal.

Why do we need burden of proof?

The plaintiff has the burden of proof, which means that the plaintiff must convince the court that the facts are rightfully presented and there are grounds for the case. ... Defendants in civil cases often work to poke holes in a plaintiff's case, rather than to affirmatively prove they are not liable.

Why does the prosecution have the burden of proof?

The prosecutor bears the burden of proof because, based on the protections of the U.S. Constitution, a criminal defendant is presumed innocent. Proof beyond a reasonable doubt is the highest burden of proof applied in any legal proceeding because the stakes – a defendant's liberty – are highest.