Why does the prosecution bear the burden of proof in a criminal case?

In criminal law, the prosecution bears the burden of proof because of the fundamental legal principle that a defendant is presumed innocent until their guilt is established. This presumption of innocence is a cornerstone of justice, ensuring that the state cannot deprive an individual of their liberty without meeting a rigorous standard of proof.12

Because the prosecution carries this burden, a defendant cannot be found guilty as long as the evidence remains insufficient or if reasonable doubts persist. In common-law systems, this requires the prosecution to prove the charges beyond a reasonable doubt. While the defendant may be required to provide evidence for certain "affirmative defenses" in some jurisdictions, the ultimate duty to substantiate the criminal charge remains with the prosecution. This structure serves as a vital safeguard against the wrongful conviction of the innocent, upholding the ethical principle that it is better for the guilty to go free than for the innocent to suffer unjustly.213