If any person is found in possession of any salmon or trout, or any instrument, explosive, poison or other noxious substance which could be used in the taking of salmon or trout, in circumstances which afford reasonable ground for suspecting that he has obtained possession of such salmon or trout, or such instrument, explosive, poison or substance as the result or for the purpose of his committing an offence against any of the provisions of sections one to four of this Act, that person may be charged with unlawful possession as aforesaid of such salmon or trout, or of such instrument, explosive, poison or substance.

Where the court is satisfied that a person charged under the last foregoing subsection obtained possession of salmon or trout, or of any instrument, explosive, poison or other noxious substance as the result or for the purpose of his committing an offence against any of the provisions of sections one to four of this Act, that person may be convicted of unlawful possession as aforesaid and dealt with in like manner as if he had been convicted of the said offence.

It shall be lawful to convict a person charged under this section on the evidence of one witness.