In a legal setting, the most strict or rigorous standard of proof is:

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Beyond a reasonable doubt is the highest standard of proof used in criminal trials, requiring the prosecution to prove that there is no reasonable doubt that the defendant committed the crime. It is a higher standard than clear and convincing, preponderance of evidence, and probable cause, which are used in civil and some criminal cases. Reasonable suspicion is a lower standard of proof used by law enforcement officers to conduct certain types of searches or seizures.

In a Legal Setting, the Most Strict or Rigorous Standard