1.  Occurs when the police take a person into custody against her will for                 purposes of criminal prosecution or interrogation
2.  Probable cause is required
a.  A reasonably prudent person would believe that the suspect has                     committed or is committing a crime
3.  Public places – warrants are generally not required
a.  Felonies – may arrest a person without a warrant when she has                     reasonable suspicion that a felony has been committed and                     that the suspect committed it
b.  Misdemeanors – may make a warrantless arrest if committed in                     her presence
i.  Aware of it through her senses
4.  Home arrests – require a warrant unless it is an EMERGENCY