What is the burden of proof that must be met before a defendant is found guilty in a criminal trial or liable in a civil suit?

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In a criminal trial, the burden of proof is "beyond a reasonable doubt." This means that the jury must be convinced that the defendant is guilty without any reasonable doubt.

In a civil suit, the burden of proof is "preponderance of the evidence." This means that the plaintiff must show that it is more likely than not that the defendant is liable for the claimed damages.