804.9  Arrests by private persons.
  A private person may make an arrest:
  1.  For a public offense committed or attempted in the person’s presence.
  2.  When a felony has been committed, and the person has reasonable ground for believing that the person to be arrested has committed it.
[C51, §2846; R60, §4549; C73, §4201; C97, §5197; C24, 27, 31, 35, 39, §13469; C46, 50, 54, 58, 62, 66, 71, 73, 75, 77, §755.5; C79, 81, §804.9]