What standard is required to justify an arrest or a search?

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Probable cause is the standard you need to justify an arrest or a search. It means there are enough facts and circumstances to lead a reasonable officer to believe that the person has committed a crime or that evidence of a crime is present in the place to be searched. This threshold is more than a mere hunch but not an absolute certainty. For an arrest, probable cause authorizes taking someone into custody. For a search, probable cause is typically required to obtain a warrant describing where to search and what to seize. There are exceptions to the warrant rule that allow warrantless actions, but those exceptions still rest on facts that amount to probable cause or an equivalent basis. Other standards apply to different situations—reasonable suspicion just justifies brief stops or detentions, preponderance of the evidence is used in civil cases, and beyond a reasonable doubt is the standard for convicting someone in court.