257.—Any person—

(a) who wilfully obstructs, impedes or otherwise interferes with any officer or man in the execution of his duties, or

(b) who wilfully induces any disease or infirmity in, or maims or injures, any person whom he knows to be a man with a view to enabling such a man to avoid military service, or

(c) who, with the intent of enabling a man to render himself, or induce the belief that he is, permanently or temporarily, unfit for service, supplies to or for such man any drug, preparation or appliance calculated to or likely to render him or lead to the belief that he is permanently or temporarily unfit for service,

shall be guilty of an offence under this section and shall be liable on summary conviction thereof to a fine not exceeding F398[1,000] pounds or, at the discretion of the court, to imprisonment for any term not exceeding six months or to both such fine and imprisonment.