The courts
burden of proof
Who must convince the factfinder, and how thoroughly. The party carrying it loses if the evidence is evenly balanced.
In full
Burden of proof combines two ideas: which side must produce evidence, and how convincing it must be. Allocation matters enormously. In a criminal case the government carries it throughout and the defendant need prove nothing, which is the practical meaning of the presumption of innocence.
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A plain-language explanation for civic education, not legal advice. When in doubt, the official source named above controls.