The courts
beyond a reasonable doubt
The standard for a criminal conviction: the evidence must leave no reasonable doubt of guilt. The highest burden American law imposes.
In full
The Constitution requires it for every element of a charged offense. Courts are famously reluctant to define it further, warning that attempts to quantify it mislead juries. Its height reflects a deliberate asymmetry: the system accepts letting some guilty people go free rather than risk convicting the innocent.
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A plain-language explanation for civic education, not legal advice. When in doubt, the official source named above controls.