Arrests
Primary source
Verbatim text below is from the Electronic Code of Federal Regulations (eCFR), a public-domain U.S. government work. Always verify the current version with the eCFR before relying on it for any legal matter.
Full Text
(a) Arrest is the taking of a person into police custody in order that he or she may be held to answer for a criminal offense.
(b) No law enforcement officer shall arrest any person for a criminal offense except when:
(1) The officer shall have a warrant signed by a magistrate commanding the arrest of such person, or the officer knows for a certainty that such a warrant has been issued; or
(2) The offense shall occur in the presence of the arresting officer; or
(3) The officer shall have probable cause to believe that the person arrested has committed an offense.
This is legal information, not legal advice. Laws vary by jurisdiction and change frequently. Always verify current law with official sources and consult a licensed attorney in your jurisdiction for advice on your specific situation.