ORS 133.220: Who may make arrest.

An arrest may be effected by:

      (1) A peace officer under a warrant;

      (2) A peace officer without a warrant;

      (3) A parole and probation officer under a warrant as provided in ORS 133.239;

      (4) A parole and probation officer without a warrant for violations of conditions of probation, parole or post-prison supervision;

      (5) A private person; or

      (6) A federal officer.