Any person enlisted as a supernumerary or special police officer, and any member of the Volunteer Police Reserve called out for active service who, without reasonable cause refuses or neglects-

(a) to serve on being called upon; or

(b) to obey any lawful order or direction,

shall be guilty of an offence and liable on conviction to a fine not exceeding one hundred new cedis, unless he satisfies the Court that he was prevented from serving or complying with any such order or direction by sickness or such other unavoidable cause as the Court deems a sufficient excuse.