Arrest means taking a person into custody that the person may be held to answer for a public offense. "Arrest" includes actually restraining a person or taking into custody a person who submits.
An arrest may be made:
(1) by a peace officer under a warrant;
(2) by a peace officer without a warrant;
(3) by an officer in the United States Customs and Border Protection or the United States Citizenship and Immigration Services without a warrant;
(4) by a private person.
A private person shall aid a peace officer in executing a warrant when requested to do so by the officer.