Section 320. Duties of fence viewers as to strays

The fence viewers shall
  view the premises where damages are claimed to have been done, and  they
  may  issue  subpoenas, examine witnesses and take any competent evidence
  of the facts and circumstances necessary to enable them to determine the
  matter submitted to them, and shall determine any dispute that may arise
  touching the sufficiency of any division fence around the premises where
  such damage was done, and from where and how the beasts  came  upon  the
  lands of the person claiming such damages and charges; if they determine
  that for any cause the claimants' lien is not enforceable, they shall so
  certify, and the owner of the beasts shall thereupon be entitled to them
  without paying any charges thereon.