Police who have probable cause to believe that a person has committed or is committing a felony or who observes someone committing a misdemeanor can make a warrantless arrest.

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This is generally referred to as a "probable cause" arrest and is considered legal under the Fourth Amendment of the U.S. Constitution. However, there are some exceptions and nuances to this rule, and it is always recommended to consult with legal counsel in any specific situation.

Police Who Have Probable Cause to Believe That a Person